Balloon Pig is a pig that appears in King Pig mode. He is shaped like a balloon with a pig's tail. The inflated form looks similar to the Fat Pig, and has two spots on the head. The ability of the Balloon Pig is to inflate like Orange Bird.
The Balloon Pig makes no other appearance than in King Pig mode. However in Angry Birds Rio, the episode Carnival Upheaval had balloons of pigs that were not alive like this one. Most likely, this pig is alive despite being a balloon. However, it is uncertain whether this is just another non-living balloon.