Troll Brother by P. Edward Auman
Series: Trolls, Book 1.
Approx. 86,750 words.
Published on July 6, 2013.
When Robert and Richard Johansson, the third, explore their new surroundings in the midst of the Rocky Mountains they inadvertently stumble into a troll. Armed with the troll queen's own machinations to infiltrate and learn whether the human race of the 21st century is ready to interact with faerie folk again after centuries apart, the little troll becomes an adopted brother to the Johanssons.