From the Super Mario Wiki
Just like the original Piranha Plant, the Paper Mario variety is red with white spots. They are located on Lavalava Island and in the depths of Mt. Lavalava. However, the Putrid Piranhas found in Paper Mario: The Thousand Year Door and Super Paper Mario are yellow with red spots. These can be found in either Keelhaul Key or The Land of the Cragnons. The Putrid Piranha is a little bigger than the average Piranha Plant and are best known for their nasty poison breath. Their first appearance was in Jade Jungle, in Paper Mario, when they attacked Baby Orange Yoshi.
The Putrid Piranhas of Paper Mario are found on Lavalava Island. These Putrid Piranhas are red with white spots and have yellow-stained teeth. Putrid Piranhas are close relatives of the Piranha Plants. Unlike most other Piranha Plants, this Putrid Piranha can survive in the hot temperatures and conditions of Mt. Lavalava. Some of them also appear as mini-bosses in the Jade Jungle located on Lavalava Island. During battle Putrid Piranhas can use a poison breath attack. This attack poisons Mario while doing two points of damage.
Paper Mario: The Thousand-Year Door
Putrid Piranhas reappear in the sequel of Paper Mario as well and can be found on Keelhaul Key as uncommon enemies. Instead of being red with white spots, they are yellow with red spots. In addition, their teeth are purple. Like their Lavalava relatives, the Putrid Piranha has glands that turn their breath into a lethal poison. Unlike their Lavalava relatives, they do not droop and are not able to live in burning temperatures.
Super Paper Mario
These are the Putrid Piranhas that live in the Land of the Cragnons in Super Paper Mario. They look the same as the Putrid Piranhas from the previous game. This Putrid Piranha emerges from pipes and will only use its poisonous breath instead of the chomp. These Putrid Piranhas have a high chance of dropping items, especially Horsetails due to the poison status being very deadly if the player has no items. It is possible to stomp it when it is exhaling the poisonous gas by jumping on its exposed head.
Putrid Piranhas appear in volume 26 of Super Mario-Kun. When a White Magikoopa ambushes Mario and his partners in Lavalava Island, he uses Putrid Piranha plants. They bite Mario's head and let out a bad breath, poisoning Mario and Goombario. The Fearsome 5, however, comes to the rescue and attack the White Magikoopa while sealing the Putrid Piranhas' mouth with tape. One of the Yoshis then defeats the White Magikoopa by using a Thunder Rage on him.
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