Gamahiro

is a giant toad that resides on Mount Myōboku.

Appearance
Gamahiro is a huge toad, easily towering over buildings and trees. He has an aquamarine skin tone and yellow eyes with grey markings around them. He also carries two huge katanas on his back, which are his main weapons with an orange sash around his stomach. In the anime in Part I, he was coloured brown.

Invasion of Konoha Arc
His first appearance was in the Konoha Invasion, when Jiraiya used him to fight Orochimaru's large snakes by using Summoning: Food Cart Destroyer Technique. With his sheer size he crushes at least one of the snakes as soon as he lands on them.

Land of Rice Fields Arc
Jiraiya summoned him again later in the anime to help Sasame, Sakura Haruno, and Naruto Uzumaki escape from Orochimaru's hideout.

Invasion of Pain Arc
Gamahiro made his Part II debut when he, along with Gamaken and Gamabunta, were summoned to assist in Naruto's fight with Pain. They fought the various animals summoned by the Animal Path until they were sent flying beyond Konoha's borders by the Deva Path's Shinra Tensei technique. After the battle, he is last seen lying at the bottom of a lake.

Fourth Shinobi World War
Gamahiro was later summoned to the battlefield by Naruto to crush a mutated White Zetsu Army clone. Naruto then left him on lookout while he deployed his clones all over the battlefield.

Trivia

 * When Gamahiro first appears in the anime, he is coloured green and brown. This is updated to a bluish colour for the Invasion of Pain Arc, keeping with the manga's colouration.
 * In Naruto Shippūden: Ultimate Ninja 4, a miniature version of Gamahiro appears as a catchable toad that is called "Professor" due to his interest in geography and such. He wears a teacher's hat.
 * When summoned during Part I, he wasn't named. It was not until Part II that his name was revealed.