Hyooman tribe

The Hyoomen Tribe appears in "Susan Strong." They are a primitive race of mutant humanoids who, like Finn, wear uniquely animal-themed hats. They are rather paranoid and speak in strange verses. After Susan discovers the Candy Kingdom, they threaten to eat the entire kingdom and all of its inhabitants (Except "Red Stripe Man", AKA Peppermint Butler) as sustenance. Nearly all Hyoomens (revealed after taking off their headgear) have what appear to be gills and fins on their heads, revealing that the Hyoomens are not human, but in fact mutants, a realization that greatly disappoints Finn. In the original storyboard, the hatch to the Hyoomens' home has "Biohazard Danger" printed on it, although this does not appear in the final cut of the episode. Unlike the rest of the Hyoomen Tribe, Susan does not remove her hat at the end of the story; thus, the possibility of her being human remains.

Appearance
Hyoomens range from very short to tall and appear anatomically identical to humans, save for their fish-like heads, which feature scales, fins, and sometimes gills. They dress in primitive garments and accessories. Each member of the Hyoomen Tribe wears an animal hat, which hides the distinctly nonhuman features of their heads.

Trivia

 * "Hyoomen" is a homophone of "Human," which Finn misinterprets.
 * The animal hats on the Hyoomens' heads at first identify them with Finn, who also wears an animal hat; however, the hats ultimately prove to have been foreshadowing of the Hyoomens' false appearances
 * Adam Muto claims Hyoomen are not as frightening as Candy Zombies, which is why the Candy People did not explode.