Yeah it seems the artists got lazy and decided to make nothing else than ogres.. I really dont see any other explanation for it.
Heck even an ogre with a lazy 5min reskin job could pass for a Yeti or something Kingdom-friendly, i wouldnt mind.
There's so much we can mod in this game, but with the incredible lack of actual creature models, well, what can we do? Wait for good modelers to finish the content i suppose 
This also ties in with the fact that all races are just humans, yeah trogs look nasty but they still have 2 legs and 2 arms. Just seems like there's like a dozen creature models in the entire game, well actually i cant even think of a dozen.
Humans (all races)
Spiders
Dragons
Darklings
Ogres
Wolves
Horses
um.. .... Hydras? No?
........... ....... Rats? no thats just the quest description, hmm.. what else.. oh yeah, summons, but those are almost just humans again but with the brute animation pack (that you can select in the soverign creator).