From the Super Mario Wiki
Frost Piranhas are a species of Piranha Plants that first appeared in Paper Mario. They are larger than the average Piranha Plants and are a sky-blue color. Mario first encountered Frost Piranhas while on his way to Starborn Valley. Along with being exceptionally strong, they had the ability to shoot icy blasts of breath that can freeze Mario and his allies (although the blasts themselves won't hurt them). Frost Piranhas were later encountered on Shiver Mountain where they were less abundant.
Frost Piranhas reappear in Paper Mario's sequel Paper Mario: The Thousand-Year Door. They can be found on the way to Fahr Outpost and were slightly stronger than before, but noticeably lacking their ice-breath ability. However, their bite could still freeze Mario or his partners if they did not perform a Guard move. Like their Paper Mario counterparts, they can burrow underground and pop up to attack. Unlike in the previous game, they cannot be jumped on in battle.
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