Strange Tales #87, August 1961. Stan Lee cover script, Jack Kirby pencils, Dick Ayers inks, Stan Goldberg colors, Artie Simek letters.
Info from Grand Comics Database

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Strange Tales #87, August 1961. Stan Lee cover script, Jack Kirby pencils, Dick Ayers inks, Stan Goldberg colors, Artie Simek letters.
Info from Grand Comics Database
The first appearance of the dragon Grogg, from Strange Tales (Vol. 1) #83 (April, 1961). Written by Stan Lee. Art by Jack Kirby and Dick Ayers, colors by Stan Goldberg, letters by Artie Simke.
Grogg in Strange Tales #83 by Jack Kirby
The anthology Strange Tales 83 was published with a cover date of April 1961. Besides original material it also had reprinted material from Journey Into Mystery 25. In the original story "From the Black Pit Came... Grogg!", Miklos Kozlov, Colonel Fedor Vorcutsky, and Grogg were introduced created by Stan Lee, Larry Lieber, and Jack Kirby. ("From Out of the Black Pit Came... Grogg", "Make a Wish", "The Masquerade Party", "The Menace of Shandu", Strange Tales 83, Marvel Comic Event)
Cheers, fuckers.
Jack Kirby and Dick Ayers - Strange Tales #83 splash with Grogg
Source
The Legend of Vox Machina
Strange Tales #87, August 1961, Pencils: Jack Kirby, Inks: Dick Ayers, Colors: Stan Goldberg