Creeches are sea creatures that first appear in Mario 3D World. They live underwater, and will occasionally leap out from the water and spin, spitting fireballs. They are water-type enemies, according to the manual.
As described by the manual, Creeches look like mutated Yoshis. They have a light-blue head and body with purple legs sticking off of it, though the legs aren't very helpful due to the face that it's tail is so long that they can't stand up. They also have yellow arms that are constantly reaching forwards.