Wallop

Wallops are species of Thwomps that first appear in Super Mario 3D Land. They first appear in World 3-1, they block Mario's path and the only way to get past them is to jump and run. They can be defeated if a Starman or Stone Leaf is used. They are shaped like a wall with black eyes and yellow pupils, with mouths and feet. There's also a related enemy in Super Mario 3D World, a Walleye.

Super Mario 3D Land
They first appear in Super Mario 3D Land blocking Mario's path in different directions.