How about trolls are able to eat heads/corpses as food (or maybe even any object they run across)? It would add a nice touch to showing how different the races are, maybe even encourage roleplaying. I'm still holding out that trolls should be able to bash huge :-).
Login as you Imm sometime, load a piece of armor and try eating it ;)
That was hardly a real answer, aymric. He's talking about mortal trolls eating things, not immorts. :)