Grotatoes are a new species of plants (specifically potatoes), created by Tennis Ball. They first appared in Welcome Back, the first episode of IDFB. They were made for Fries to make more fries for him. They are modified to grow in Yoyle City, whereas normal potatoes can't grow in Yoyle City.
Not much is known about Grotatoes, except for the fact that according to Tennis Ball, they might have some side effects.