He is a grey wild boar with a long mane, and has numerous spots on his back and face.
Role on Reality TV Island
A wild boar appears in the Water Run minigame. It runs around wildly and, if it hits someone, makes them bounce back and spill all the water in their jug. The boar can be avoided by jumping over it.
Role on Snagglemast Island
The wild boar reappears, although it is not hostile this time. It stands in place and cannot hurt you.