Living Cannon (Ribbit King)

These "Living Cannons" are sentient, four-legged creature found primarily on the Planet Techtron.

Description
They are large, rotund creatures with four mechanical legs extending from the side of their bodies. They have an opening on their rear end mirroring a opening to a cannon.

They will automatically swallow whatever comes within their line of sight, swallowing it with their frog-like extendable tongue. It's unclear as to how they do it, but upon doing so, they will build pressure within their bodies until the object or creature is shot out from their back opening.