Grand Cannon

Grand Cannon (グランドキャノン) is a cannon enemy from Mega Man Zero 3 that looks like a igloo, as it was made specially for frozen terrain. It shot spheres in various angles.

Trivia
Early in the game design, Grand Cannon is called "Eskimo Cannon" (エスキモー砲台), as show in sketches of Rockman Zero Official Complete Works, and would appear with a unused Yeti sub-boss.