Company Names, addresses, dates:
  Trout & Turner, Cloud & Main Streets, Front Royal VA (1901-1912) ^1,2
  Trout & Turner, 201 E. Main Street, Front Royal VA (1912-1930) ^2,3
  Trout Drug Co, 201 E Main Street, Front Royal VA (c.1930-c.1994) ^3,4

Notes:
In 1901, Henry Trout, Marcus B. Turner, and Dr. D.J. Turner bought out the Schaarman & Co drug store. They called the new store "Trout & Turner".¹

Isaac Henry Trout Sr. (1872-1946)⁵ was the senior member for Trout & Turner. He came to Front Royal in 1890, where he engaged in the drug store and theater businesses⁴.
His name is often listed in newspaper articles as "I. Henry Trout", so he presumably went by "Henry" rather than "Isaac".
He eventually became the sole owner of the business in 1930^4,6.

Mark Bird Turner (1880-1955)⁷ was one of Trout's partners in the Trout and Turner drug store¹. He was listed as a registered assistant pharmacist in 1910⁸.
I could not find evidence that he was related to the 3rd partner, Dr D. J. Turner (1871-1903)⁹, who had the same last name.

Location
The 1901 announcement for the new "Trout & Turner" drugstore said it was located at the corner of Cloud & Main Streets¹. Newspaper ads for the store at that time said it was located "next to P.O.". The Front Royal Walking Tour pamphlet says that the Post Office was located inside the Amiss building². That building is on the south-west corner of the intersection of Cloud & Main Streets, so presumably the drugstore was part of the Amiss building at that time.
A February 1910 newspaper ad said that Trout & Turner had moved to a new location .¹⁰ This may have been referring to the "Trout Building" at 201 E. Main Street, which is where the store eventually ended up. That building is depicted on a postcard shown below.

Name Confusion?
The Front Royal Walking Tour pamphlet² referred to the firm as "Turner and Trout" instead of "Trout & Turner". I think maybe that was a misprint, because all of the newspaper ads I could find said "Trout & Turner".
For what it's worth, there was a firm called "Turner & Trout" in Front Royal at one time. It was located on the corner of Main & Chester Streets starting in 1872, but it was a different set of partners (James E. Turner and Wilbur A. Trout)¹¹. I couldn't find references to that business after 1872, so it was likely short-lived.

Rexall
Starting about February of 1910, many of the newspaper ads referred to the store as a "Rexall Store", so apparently it joined the Rexall chain of drug stores about that time¹⁰.

Later Years
Some of the labeled bottles below say "W.E. Herr Pres.".
Winfred Eugene Herr (1908-1991)¹² started working at the Trout Drug company in 1939¹³. He is listed as a drugstore assitant manager in the 1940 US Census. The Census also indicates he was married to Trout's daughter, Laura Trout Herr, so he was Trout's son-in-law. I don't know what year he took over the Trout drug store, but it was likely on or before Henry Trout passed away in 1946.


Bottles:

	Clear 2.8" (1/2 ounce) bottle, embossed: front: TROUT & TURNER / THE Rexall STORE / FRONT ROYAL, VA. rear: 1/2 OZ
	Amber 3" screw-top bottle with horizontal ridges, and a label that says: label: GENTIAN VIOLET / ... / TROUT DRUG CO. INC. / W. H. HERR, PRES. / THE Rexall STORE / PHONE: ME 5-3115 FRONT ROYAL, VIRGINIA
	This is an amber 4" screw-top bottle with label that says: label: THERMOTABS 100's / SALT TABLETS / ... / TROUT DRUG CO INC / W. E. HERR PRES. / THE Rexall STORE / PHONE: 635-3115 FRONT ROYAL, VIRGINIA
	This is an amber 4" screw-top art-deco bottle with label that says: label: AROM. SPT. OF AMMONIA, U.S.P. / ... / TROUT DRUG CO / W. E. HERR OWNER / THE Rexall STORE / PHONE: 390 FRONT ROYAL, VIRGINIA I think this is older than the labeled bottles above because the phone number is only 3 digits.

	This post card depicts the interior of the Trout Drug store. On the top is written:     Trout Drug Co's. Store Front Royal, VA. On the back side, it says:     PUBLISHED BY TROUT & TURNER ... It looks like it had 3 tables set up. I don't know if that means they served food, or if they only served drinks (such as soda).
	This post card depicts the Trout & Turner Drug store. On the bottom is written: TROUT & TURNER / DRUGGISTS / TROUT BUILDING, FRONT ROYAL. VA.
	This photo was taken June 2017. It depicts the building in the postcard above at 201 E. Main Street.
	This is a 6.2x3.5" cardboard advertisment for WAMPOLE'S PREPARATION, that says: TROUT DRUG COMPANY / PHARMACISTS / FRONT ROYAL - VIRGINIA It compares the product to other historic achievements such as the invention of the light bulb, the airplane, etc. It mentions the George Washington Bridge in 1931, so it dates to sometime after that.
	This is a 24-page booklet for Dr. C.I.Shoop's products, copyrighted 1908. It describes various products from Dr Shoop including his Catarrh remedy, Lax-ets laxatives, Preventics (which claims to cure colds), Croup cure, Magic Ointment for Piles, etc. On the back is stamped: TROUT & TURNER, DRUGGISTS, / FRONT ROYAL, VA.