Cronby the Troll

Cronby the Troll appeared in 1996 Give Yourself Goosebumps book called Deep in the Jungle of Doom and the 2015 movie called Goosebumps. Cronby is a cave troll that resides in the Amazon Rainforest.

He is seen in some bad endings: For a good ending while deciding to bet for the third piece of gold, Cronby asks you one more Goosebumps question. After answering correctly, Cronby hands you the three gold nuggets. You give them to the Stone King and he rewards you and Zoe handsomely.
 * The first bad ending has a Giant Bat eating the reader and Cronby.
 * The second bad ending consists on Cronby hypnotizing the reader into being his slave forever.
 * The third bad ending has Cronby eating the reader and Zoe if a Goosebumps question is given the wrong answer.

He'd also appeared in the 2015 video game called Goosebumps: The Game, but he's referred as Cronby the Leprechaun.