Sgt. FrogSgt. Frog.

Sgt. Frog, known in Japan as Keroro Gunso (Japanese: ケロロ軍曹, Hepburn: Keroro Gunsō; lit. 'Sergeant Keroro'), is a Japanese manga series written and illustrated by Mine Yoshizaki, which is published and serialized in Kadokawa Shoten through its Monthly Shōnen Ace magazine since April 1999. The story follows the attempts of a platoon of frog-like alien invaders to conquer Earth.