The troll is nicely done. It catches the spirit of the trolls in the movie "Lord of the Rings". I do think the polycount could easily be cut by about 500, though, without losing much. There are a lot of wasted polys on the snout (which could be done with a texture) and the hands (the same).
Still, this is a small point.
I would be interested in seeing more. As for creatures, how about a bull with long, sharp horns?
Best regards,