The Pig Crab (unofficial name) is the midboss of stage 3 from Rocket Knight Adventures.
This midboss appears as a mecha with crab arms piloted by a pig. It stays at the bottom of the screen, swinging its arms around and eventually trying to hit the player directly. If the player destroys the crab arms it will start shooting ripple lasers upwards. the player must hit its cockpit in order to damage it.