From the Super Mario Wiki, the Mario encyclopedia
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Chomp Sharks, also referred to as Shark Chomps or Giant Chomp-Chomps, are giant sized chainless Chain Chomps that constantly move forward while gnashing their jaws. The player is unable to fight them in any way, and as such must simply run from or otherwise avoid them.
Yoshi's Island series
Super Mario World 2: Yoshi's Island
Shark Chomps are introduced as one of the three varieties of "Chomps" in Super Mario World 2: Yoshi's Island, where they appear in Marching Milde's Fort and KEEP MOVING!!!! In the former level, the Shark Chomp appears right after a group of Incoming Chomps. These giant Chomps relentlessly chase after Yoshi, gnashing through anything in their way. Their appearances in certain levels make backtracking impossible, as they are almost invulnerable and will often eat anything on which Yoshi can land. Eventually, the Shark Chomp chases Yoshi to a platform it cannot eat and breaks its teeth, causing it to tear up in pain and fall off the screen.
Yoshi's Island DS
In Yoshi's Island DS, Shark Chomps act exactly as they do in Super Mario World 2: Yoshi's Island and even use the same sprite, though due to the lighter colors it seems to have been based off the Yoshi's Island: Super Mario Advance 3 sprite instead. One appears in Rompin', Stompin' Chomps.
Yoshi's New Island
Super Princess Peach
In Super Princess Peach, Shark Chomps are called Big Chain Chomps, a more accurate rendition of their Japanese name. They are found in Giddy Sky, specifically Giddy Sky 7-2 and Giddy Sky 7-8. Rather than eating terrain, Big Chain Chomps are usually found bouncing down hills provided with gaps in which the princess and her umbrella may hide. Some of them are also seen periodically falling down pits. They are noticeably smaller in this game, but still much larger than normal Chain Chomps. One is also seen in the background of the Wavy Beach world select screen, bouncing on the water surface, resembling Incoming Chomps' background sprites. According to the game's Glossary, Big Chain Chomp is "A giant Chain Chomp. Very dangerous!".
Names in other languages