Fire Nipper Plant

Fire Nipper Plants, also known as Fiery Walking Piranhas or Walking Ptooies, are rare fire-breathing versions of Nipper Plants.

Super Mario Bros. 3
In Super Mario Bros. 3, only one Fiery Walking Piranha appears in the entire game, near the end of World 7-8. It stays in place, and when Mario or Luigi approaches, it attacks him by spitting fireballs that arc in his direction. It acts similarly to a red Panser from Super Mario Bros. 2, though a Fiery Walking Piranha can shoot up to four fireballs at once instead of two.

Super Smash Bros. Ultimate
In Super Smash Bros. Ultimate, Fire Nipper Plants are mentioned briefly by Viridi in the Japanese Palutena's Guidance dialogue for Piranha Plant. They are not mentioned at all in the English version; however, when the game is set to Simplified Chinese, Traditional Chinese, or Korean, the subtitles include the name Fire Nipper Plant in English.