|Artwork of Croaker from Mega Man 2.|
Croaker (also known as Kerog) is a frog robot, with the ability to spawn "Petit Kerogs". Croaker was a robot that was originally a member of the underwater robot carnival, but was repurposed for combat by Dr. Wily. They are enemies that originate from Mega Man 2 from Bubble Man's stage.
When a Croaker spawns, it will launch three Petit Kerogs from its mouth at three different angles. If at least one Petit Kerog is alive, all on-screen Croakers will do nothing until they are all despawned or destroyed. If all three Petit Kerogs are either despawned or destroyed, an on-screen Croaker will spit out three more Petit Kerogs. If the Croaker is underwater, the Petit Kerogs will be launched higher and will jump higher.
Petit Kerogs have 1 HP and deal 1 HP contact damage, they attack by jumping towards the player.
If the player gets behind Croaker, it will turn around to face the player.
- Croaker also appears in Mega Man: The Wily Wars.
- The names "Kerog" and "Croaker" both makes references to the sounds that frogs make.
- The name "Kerog" is a combination of the Japanese word "Kero" (ribbit) and the English word "frog".
- The name "Croaker" comes from the English word "croak".