Ribbit King

Players compete on five Frolf courses, each of which features four holes. The objective of the game is to earn the most points possible through a combination of landing the frog in the course's hole in the fewest strokes as well as having the frog engage with various stage elements, such as spheres that contain certain point amounts, flies that the frogs can swallow, and various events that require player input (such as a well-timed button press or fast control stick movements) to earn points. The player can also equip up to five power-ups, which they can expend during a match to give their frogs additional advantages, such as the power to swim through lava or an increase to the range in which they can eat a fly. Different frogs can also be unlocked for use, each of which has different properties.

New frogs and power-ups can be purchased from defeated opponents or randomly from a gumball machine in the game's central hub. Defeating an opponent in the story unlocks them for use in the game's multiplayer mode; up to 11 playable characters can be unlocked, plus one additional character exclusive to each console. Additionally, the game features an achievement system in the form of special bottlecaps, which can be unlocked in an in-game gallery by completing specific objectives.

The game received mixed reviews upon release. Aggregating review websites GameRankings and Metacritic gave the GameCube version 63.07% and 60/100 and the PlayStation 2 version 63.64% and 58/100. Former GameSpot journalist Ryan Davis gave the PlayStation 2 version 5.9 out of 10, saying that it focused more on the bizarre storyline than the gameplay, while Mary Jane Irwin of IGN gave the GameCube and the PlayStation 2 versions a score of five out of ten.

In Japan, Famitsu gave Kero Kero King a score of 30 out of 40.