Kaboomba

A Kaboomba is a walking cannon enemy found in Super Mario World 2: Yoshi's Island. They shoot cannonballs that explode after a few seconds. Kaboombas only appear in the deep undergound maze level and Raphael the Raven's Castle.

Kaboombas would go on to be featured in Super Princess Peach under the name "Cannon". The Calm Cannon, a sleeping variety of Kaboomba, also appeared.

It is interesting to note that the name "Kaboomba" is a portmanteau of the words "Kaboom!" and Goomba.