The Terra Gups are the new Gups in the spinoff series, Octonauts: Above And Beyond. The giant ray shaped Gup, known as the Octo-Ray, is used for transporting fellow crewmates, small gups, and terra gups to certain regions on earth.
The Terra Gups are land Gups that the Octonauts use to go onto land after sea. Some are used in the desert for example the Terra Gup 1 was used in the Arabian Camels episode. It was also seen to drive through the ocean in The Mystery of the Longfin Eels.