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Sgt. Frog – Known in Japan as Sergeant Keroro Sgt. Frog – Known in Japan as Sergeant Keroro Sgt. Frog, known in Japan as Sergeant Keroro (ケロロ軍曹 Keroro Gunsō), is a manga and anime series created by Mine Yoshizaki. Sgt. Frog (Keroro Gunsō) Enlarge Sgt. Frog (Keroro Gunsō) This comedy is published in Japan by.