From the Super Mario Wiki, the Mario encyclopedia
Lumpy, a green colored Ratooey
First appearance Paper Mario: The Thousand-Year Door (2004)
Notable members

Ratooeies are a species of rodent that have only appeared in Paper Mario: The Thousand-Year Door. There are only two known Ratooeies in existence: Lumpy and the Businessman. The name of this species comes from the French dish ratatouille.

Apparently, Ratooeies come in a multitude of colors; however, green and blue are their only confirmed fur colors. Additionally, Ratooeys are very tall compared to other species. Ratooeys achieve this height by standing upright on their hind legs.