According to Wikipedia, his Japanese name Gojira is a combination of two Japanese words meaning "gorilla" and "whale". In fact, he was initially meant to be a cross between a gorilla and a whale.
At some point, the design changed and he became a reptile - part Tyrannosaurus, part Stegosaurus, part Iguanodon, and part run-of-the mill crocodile.
This "blended chimera", as Wikipedia puts it, has battled a number of Not Yetis in his day.
Let us review...
Godzilla vs. Wolfman (1964, unreleased)
Godzilla vs. Robo-Yeti / Albino Yeti (disguise)
Source: Godzilla: The Series (1998-2000)
Godzilla vs. Great Watchuka
Source: The Godzilla Power Hour (1978)
