Poison Pokeys are a sub-species of Pokey that extremely resemble Pokey Mummies and appears in Paper Mario: The Thousand Year Door. However, the two are completely different species, as Pokey Mummies are actually just dead Pokeys. Poison Pokeys are found solely at the Riverside Station in Paper Mario: The Thousand Year Door
They may be fought like you would a Pokey, but are stronger and can induce poison.