Sgt. Frog 52-103 Giroro: Bright Red, Gritty Days, Sir!\NKoyuki Fights to Protect the Person Who's Important to Her, Sir! - Watch on Crunchyroll

Sgt. Frog 52-103 Atrocious, Annoying Legend of the Universe's King of Forgetting Homework, Sir! - Watch on Crunchyroll

Sgt. Frog 52-103 Fuyuki Won't Give Up On Sports Day, Sir! / Giroro: The Cat Knows, Sir! - Watch on Crunchyroll

Season 1, Keroro Wiki

Sgt. Frog 52-103 Keroro: Froggy Races, Sir! / Mois: Sleeping Beauty,Or, Like, Slumber Desired, Sir? - Watch on Crunchyroll

Sgt. Frog 1-51 Keroro's Energy-Saving Invasion, Sir! / Keroro's Countryside Exploration, Sir! - Watch on Crunchyroll

Sgt. Frog 52-103 Fuyuki & Momoka's Secret Mystery Date, Sir! / Keroro: Come On, Let's Make a Video Game, Sir! - Watch on Crunchyroll

Sgt. Frog 52-103 Dororo: The Counterattack is Mine, Sir! / Giant Frog vs. Great Monsters of the South Seas, Sir! - Watch on Crunchyroll

Sgt. Frog 257-307 Shugo Kero: Dokki-Doki Party, Sir! / Dororo: Here Comes Dororou, Sir! - Watch on Crunchyroll

Sgt. Frog 257-307 Keroro: The Wish-Granting Weevil, Sir! / Keroro: Go For It, Trash Bag, Sir! - Watch on Crunchyroll

Sgt. Frog 1-51 Giroro: No Tears for the Red Oni, Sir! / Giroro: Let Setsubun Fly, Sir! - Watch on Crunchyroll