Jollyfist is the Ghouled version of the Jellyish. They are mainly coloured dark blue with tan accents. Jollyfists can be used as a tracker, as seen in "Lightwell" when it is used by C.C. to track Eli Shane to the Lightwell. In Return of the Elementals, the Goon's new Dark Slinger is seen to own one.
- Protoform Abilities - Stings like a jellyfish.
- Oogi - Covers an opponent with sticky goo that stings and is difficult to remove.
- Goo Boar - Spits a stinging goo all over an opponent's face, making it difficult to breathe.
- Ticktocksplat - Sticks onto foe, then explodes leaving a gooey, stinging mess.
- Exo-tox - Spits a sticky goo that hardens into a dark resin, trapping an opponent inside.
- Jagtagger - Masquerades as a dud, but can attach a tracking device to an opponent when its protoform hits.
- The Trade (First appearance)
- Mission: Improbable
- Slugterra: Return of the Elementals
- Slugterra: Into the Shadows