[quote=@Hellis]
The only problem is that the troll are very different in biology and information regarding what a troll is.
[/quote]

Aye, but it's not a big problem. Let's say that there are as many kinds of trolls are there usually are elves (one for each biome that they can inhabit)such as rock trolls, frost trolls and so on. Krobb would then be a part of the vanilla variant most commonly known as simply "troll". Mog on the other hand would still accurately be called a troll, but belongs to the subclassification "mountain troll" or "rock troll" depending on how the families are named.