From the Super Mario Wiki
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Pungry (who assumes the name The Mover in the Pit of 100 Trials) is a sunglasses-sporting Puni who is found in both the Great Tree shop and on random floors in the Pit of 100 Trials in the game Paper Mario: The Thousand-Year Door. His name is likely a portmanteau of "Puni" and "hungry". He is the only Puni to have black eyes and a hat.
If and when Mario finds him in the Pit of 100 Trials, he can advance Mario further down the Pit, or warp him back up to the top. For ten Coins, Mario can go two floors deeper. For thirty Coins, Mario can go five floors deeper. Pungry can also return Mario to the entrance of the Pit for ten Coins. He makes Mario close his eyes so he will not know where the secret passage is.