Trollhunters2018
Tales of Arcadia : the secret history of Trollkind
by Marc Guggenheim
"When fifteen-year-old teenager Jim Lake stumbled upon a magical amulet that gave him a powerful suit of armor and the title of Trollhunter--defender of the good trolls. In one training session, Jim's troll companion, Blinky, must detail the battles of Kanjigar the Courageous--his struggles, triumphs, and failures in leading the safety of Troll Market!"--
— from OpenLibrary
1 edition at OpenLibrary