Garpo is a member of the Geckles.
Garpo is collecting moss-milk and singing a song about "Gilly" when he, Ginkle, and Groko stumble upon Kai and Zane. They believe the ninja are working for the Skull Sorcerer, so they take the two the chancellor, Gulch.
Garpo and the other Geckles then agree to allow Kai to become their new leader and he gives out their plans such as defeating the Skull Sorcerer and uniting the Geckles with the Munce.
Garpo is one of the Geckles who doesn't agree in a meeting with the Munce. They decide to settle the matter by performing a slug race. Garpo cheers for the slug which wouldn't allow the meeting, but is disappointed when the other slug wins.
The Geckles head to the truce meeting, but they stare down their rivals upon meeting them. When the ninja are able to calm everyone down, they all run away after hearing the sound of Grief-Bringer.
Garpo and everyone else took refuge at the Geckle Strong-Cave. The Geckles realize they are also with the Munce and tension rises between the two tribes. Nya discovers a possible exit and requires everyone to work together to move the rocks. After realizing there is no way out, the Geckles and Munce make peace with each other and unite.
The Skull Sorcerer arrives and the ninja surrender themselves in exchange for the Geckles and Munce to remain free. However, the Skull Sorcerer lies and everyone is captured.