Lub Glubs

L ub  Glubs are creatures who appear in "Beautopia." They resemble inflatable pool toys. The Glub Glubs took over Beautopia, the place where the Hyoomen Tribe used to live.

They resemble pool toys, but are really shadow beasts that seem to feed on the Hyoomen tribe, as one was seen biting meat off of a skull that had a hat like Fionna's.

It is shown as if they are weak against fire; they tried to stop Jake from lighting the City Heart, and when he did in spite of their efforts to stop him, they burned up.

Jake states at multiple times that they remind him of his parents, then to proclaim himself crazy.