Candy Corn Rats are sometimes seen around the Candy Kingdom. In "From Bad to Worse," Princess Bubblegum's lab rat, Science, plays a key role in the episode. Also, in the episode "Too Young," there are two candy corn rats near Finn and Princess Bubblegum when they are about to prank the Earl of Lemongrab. Science makes a small cameo in "The Suitor," looking at Braco and Peppermint Butler when they enter Princess Bubblegum's lab.
They are living candy corn that are horizontal and have rat-like features. They have black eyes and small ears. Their head is near the point and their orange noses are at the tip. Their front legs are orange and their hind legs are yellow. They also have small, thin yellow tails.