Troll cartoon movie, can't remember the title
So, there was this movie I saw when I was really little either in the late 80s or the early 90s. It was about Trolls, everyone in it was trolls, and there was this girl, maybe a princess, and she was locked in a tower by this evil warlord type troll. There was something special about when she would sing and it awakened these little baby trolls that were in eggs, and they could open this portal to another world that was like paradise. Then she escaped and that was a big thing, and this guy who was helping got captured and tied to this evil willow tree that like sucked the life out of him or something. Of course the good guys win in the end it is a kids movie.
But I don't know the names of the character or the movie, if anyone remembers anything I would be so great full. I have been searching for it for a really long time.