Grumblebums are enemies in Skylanders: Swap Force. One of them however is a Skylander exclusive to the Academy TV series. Different types of Grumblebums Grumblebum Rockshooters Grumblebum Thrashers Notable Grumblebums Bad Breath This article is a stub. You can help Skylanders Wiki by editing this page. Grumblebums Grumblebum Thrashers - Grumblebum Rockshooters Retrieved from "https://skylanders.fandom.com/wiki/Grumblebums?oldid=116142" Categories: Article stubs Enemies Skylanders: Swap Force Species Mutants Skylanders Academy Community content is available under CC-BY-SA unless otherwise noted.