In principle, there is such a mod - BDT, it had a yeti (a demon with its head) and a bank with them, it might be useful there.
Otherwise, let's replace the unfinished yeti with ours and add it to random generation (by the way, I don't know how this will affect the Random Map Generator, it seems to have its own complex generation schemes).
Added 1 minute ago
to be honest, at least for now, I don't want to create other animations, when there is a sufficient minimum... besides, these also need to be checked in the game, whether everything fits/works well, etc.

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1