Poison Piranha Plant

Poison Piranha Plants are a variant of Piranha Plant that first appears in Super Mario Odyssey. When they see Mario, they spit poison, which creates a puddle if it touches the ground. When Poison Piranha Plants are about to spit poison, their heads become purple.

Super Mario Odyssey
Poison Piranha Plants are found in the Iron Road section of the Wooded Kingdom, in the Metro Kingdom, and on the Dark Side. If Mario throws Cappy at one, it will swallow him, stopping it from spitting poison. The plants can also be defeated by running into them in this state. However, knocking a rock into a Poison Piranha Plant causes it to swallow the rock instead, allowing Mario to capture it with Cappy. When controlled by Mario, the plant gains his cap and his mustache, and the player is able to spit poison by pressing. Big Poison Piranha Plants that spit bigger balls of poison also appear.

Super Smash Bros. Ultimate
In Super Smash Bros. Ultimate, Poison Piranha Plants (simply called Poison Piranhas) are mentioned briefly by Viridi during Palutena's Guidance dialogue for Piranha Plant.

Mario Kart Live: Home Circuit
Poison Piranha Plants reappear in Mario Kart Live: Home Circuit, where their heads are always purple. They appear on the trackside of the Jungle environment and spit out poison onto the track. Driving over a puddle causes the poison to cover the player's screen, obscuring their view similar to an Inky Piranha Plant. Driving into one also slows Mario or Luigi down for a few seconds.

Names in other languages
Gift-Piranha-Pflanze Pianta Piranha tossica