From the Super Mario Wiki
Petit Piranhas are Lava Piranhas at their youngest state, appearing in Paper Mario. Only Lava Buds branching off from a Lava Piranha's main stem are known to produce Petit Piranhas; the seed-like spores they launch are lit upon exiting their mouths. Petit Piranhas are able to attack immediately after being released, so Lava Buds will fire Petit Piranhas if in danger. A Petit Piranha has a very high attack rating of 6, but they explode after making contact with Mario and company, no longer being on the battlefield. Additionally, Petit Piranhas, along with Tuff Puffs and Crystal Bits, have lower HP than any other enemy in the game.
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