Sgt. Frog
 For the main character of the series see KeroroSgt. Frog (ケロロ軍曹 Keroro Gunsō lit. Sergeant Keroro) is a manga series by Mine Yoshizaki. It was later serialized into an anime TV series directed by Junichi Sato. Both the anime and manga are comedies that follow the attempts of a platoon of frog-like alien invaders to conquer Earth.