Switched (Trylle series)

Wendy thought she was just your average teenager with bad hair and didn't really fit in. One day Finn, a boy in her class, comes along he tells her that she is part troll and that he is too. Wendy has the opportunity to meet her real mother and people just like her. When Wendy gets there not only does she find out she is a troll, she is the princess of Forening . The Vittra, a vicious tribe of trolls, will stop at nothing to get to her. But why are they so desperate? but does Wendy really want to be there, or does she miss her little home with her "brother" and her "aunt"? This books is changes your whole stereotype of trolls, you will never think of trolls the same.