A few questions

I got a few questions and I hope yo answer them.
1. What is the trolls official language?
Someone knows that? Trollsih or what?
2.Where do they live? What country? How do they live?
The 3th and the last question. I just wonder why elves are so popular here..?
I dont ask that just cause I just like trolls better, or mean anything thats bad about elves or something. I just wonder..?
I thought that elves were awesome before,
but I think they are so weird sometimes...