Hi! Jeen Beet is a monster I made up, and I just recently drew him.
Jeen Beet is on the Rejection Island,
and is a rejected monster. The Rejection Island is a secret island you can find by tapping on Mount Knotshurr while the white monster is there. Then, Go to the composer island and tap on the green monster when he pops up. Finally, wait until composer island's eyes open up, and tap on that. Go to Mount Knotshurr again, and tap on it. It should have a button saying, "Enter Mount Knottshurr" on it.
Note: All of this is fake, this is not canon to the game.
Jeen Beet plays the bass, and is the first of many Rejection Island monsters.