RTF is a global modification that replaces all towns in the game.

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But, if I remember correctly, Yetis were created by mages in a similar way to Orcs, only using snow gorillas and humans as the base materials.

Hmm, but there's already a canonical Yeti, it's funny that he fights for the Naga, and I was also very surprised by his size - he's holding a wolf in his palm.

Well, I would say that the Yeti is a distant relative of the creatures from Might and Magic VII, my only questions are about the armor - is he so smart that he understands its necessity, or is he a trained beast? If he's smart, is he really a beastman, or is he a spirit of the elements in a mortal body like a Kappa? Or maybe it's some other variant, like a people warped by magic.

For a beastman, he seems too big, but if he was a hybrid creature, that explains everything, except for the question of why they didn't settle all over Ashan like Orcs and Centaurs.