Plantitan

Plantitan was a huge plant hybrid created by Cosmos that was sent to Bright Spark's lab to fight the Locked Room Gang during Baby Fork but was defeated by them. It is owned by.

Baby Fork
The Plantitan was created by Cosmos out of several different plants, including peashooters, bonk choys and snapdragons.

During the events of Baby Fork, Bright Spark starts a videochat with Cosmos after contacting him on Blue Ocean's science forum, requesting one of Cosmos' monsters to help clobber the gang. After agreeing to pay after seeing the creature itself, Cosmos sends him the Plantitan under Bright Spark's name as to avoid the gang figuring out he sent Bright Spark the creature.