This is a fantasy game with fantasy monsters, there are no rules to say what can be what. If Beth make a monster and call it a troll, its a troll.
http://tvtropes.org/pmwiki/pmwiki.php/Main/AllTrollsAreDifferent.
You can't go wrong OR right with them.
I think trolls should be hardworking blacksmiths, toiling away underground forging magical weapons.
No! Trolls should be vile monsters, living under bridges and harassing goats!
You're both wrong! Trolls should be tiny wrinkled men with big poofy hair that are collected by old women!
Actually, trolls should be tall blue-skinned, large-tusked people that speak with Jamaican Accents
How about large rock-monsters that get smarter as they get colder?
Let's go with Trolls being three-eyed, green-furred apes.
And who said redguards can't be apes?
The NAACP :flamethrower: