Sherm

Sherms are tank-like enemies that appear in Super Mario Odyssey. They are green with Bowser's emblem printed on them, and can be found in the Metro Kingdom at nighttime, the Wooded Kingdom, and the Underground Moon Caverns in the Moon Kingdom. When captured with and controlled by Cappy, the player can aim its cannon with the right joystick (as well as by tilting the Joy-Con/Pro Controller), and fire shells with. Shells can also be used to collect items. They are used to defeat Mechawiggler.

They are likely named after the American tank, used extensively in World War II.