The Moonrock Pengull is a hostile Mob exclusive to Don't Starve Together and introduced in Return of Them. It is found on the Lunar Island during Winter when the player walks near the Ocean. It is a Pengull variant, taking on a more horrific appearance including skeletal wings, feet and beak and an ice-like body with visible internal organs.
They will attack nearby Mobs, similarly to Hounds, however they do not attack other Pengulls or Moonrock Pengulls.
Just like Pengulls, they have a hunger bar that lasts for 12 days. They will take damage from starvation and will eventually die. The Moonrock Pengull drops Ice and Monster Meat upon being killed.