Golden Chomps are recurring enemies in the Mario series. They are large Chain Chomps that contain Power Stars inside them and are gold in color.
In Super Mario Galaxy, Golden Chomps appear in the Gusty Garden Galaxy. This Golden Chomp contains a hidden Power Star which Mario must obtain by using the Rainbow Star, which appears after collecting all of the ? coins in the mission, to destroy to Golden Chomp.
In Super Mario Galaxy 2, Golden Chomps are forged in the Chompworks Galaxy and contain Power Stars much like the Golden Chomps in the game's predecessor.