This book, called Horns and Wrinkles, by Joseph Helgerson, is about a girl and her cousin. Her cousin mysteriously grows the horn of a rhinoceros in place of his nose. The girl meets water trolls, rock trolls, an old lady and her brother, and her great great great great uncle in a quest to get her cousin back from the rock trolls and restore her family and friends, a dog, and a bird, who had been turned into stone, back to their normal states.
This book deserves ten stars out of a ten star rating.
If you like adventures, magic, and trolls, you'll like Horns and Wrinkles.