Croagunk is a dark ultramarine-blue, bipedal Pokémon that resembles a poison dart frog. It has yellow eyes, which are surrounded by black markings. There are orange, expandable pouches on its cheeks, and its teeth are wide and flat. A black marking encircles its upper arms and chest, and there are white bands around its chest. The white markings are slightly higher up on the female Croagunk than the male. It has three fingers and toes, most of which are black. The only digits that are not black are its center fingers, which are orange instead.
Croagunk's cheek pouches and fingers contain a poisonous fluid. However, the fluid squeezed from its finger is also a significant ingredient in remedies for lower back pain once diluted. The cheek pouches can be used to create an unnerving sound. When its opponents are distracted, it tries to stab them with its fingers. Despite this, it fights others only to ensure its own survival. Croagunk is a popular Pokémon due to being chosen as a mascot for a pharmaceutical company. Croagunk and its evolved form, Toxicroak, are related to Seismitoad.
Croagunk's English name, along with numerous others, was released on February 13, 2007. Due to the poor quality of the image, it was believed its name was "Croalurk".
No other Pokémon has the same typecombination as Croagunk and its evolved form.
Croagunk and its evolved form are also the only Pokémon with a double weakness to the Psychic type, due to their unique typing.
Croagunk is one of few Pokémon to have its handheld game sprite differ from its 3-D image. While in Pokémon Diamond, Pearl, and Platinum it is shown to have pink cheeks, its 3-D models, official artwork, and anime appearance show it with yellow-orange cheeks.
In Platinum, in front of the PastoriaGreat Marsh, if the player stands behind the Croagunk Wall, with their head sticking out of it, a wild Croagunk may come by, cry out, and then walk to the Great Marsh.
In the Pastoria City Poké Mart, a wooden Croagunk statue can be seen on the counter. If interacted with, it will mention how "Even though it's made of wood, it still seems like it's seeping poison..."
Croagunk may have been based on the poison dart frog. The white markings around its midsection resemble sarashi, with the differing placement between male and female Croagunk corresponding to different styles worn by men and women.
Croagunk may be a combination of croak and gunk.
Gureggru may be a combination of ケロケロ kerokero (onomatopoeia for a frog's croaking) and げろげろ gerogero (disgusting). It may also derive from 汚れ yogore (filth).
In other languages
From ケロケロ kerokero (onomatopoeia for a frog's croaking) and げろげろ gerogero (disgusting). May also derive from 汚れ yogore (filth).