Big Chain Chomp
From the Super Mario Wiki
This Chain Chomp, despite its name, is not attached to any chain, but it is larger than a normal Chain Chomp. It mostly acts as an obstacle that Princess Peach and Perry need to avoid, and is usually found bouncing down hills provided with gaps in which the princess and her umbrella may hide. Their attack patterns can be thought of as similar to those of the Chomp Sharks, and some of them act similar to Chomps.
According to the game's Glossary, Big Chain Chomp is "A giant Chain Chomp. Very dangerous!".
Also, in Paper Mario: Sticker Star, 3 Big Chain Chomps need to be used in order to get to Petey Piranha who is the guardian of the fifth Royal Sticker in Rumble Volcano. One also appeared in Chomp Ruins. They cannot actually be harmed (outside of jumping on them pre-battle when they are asleep, which is mitigated by the fact that they, like all enemies and even Mario, recover health when asleep), instead, they are actually the basis of a puzzle. The player has to hammer their post down while they are asleep, then engage them in battle and use any attacks before they wake up. Afterwards, the Chain Chomp will then lunge at the player, causing 10 damage and ending the battle early due to escaping confinement. This attack cannot be blocked.
A single Big Chain Chomp appears in Mario & Luigi: Paper Jam. Iggy and Morton use the Big Chain Chomp for one of their attacks.
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