The Jellofish is a friend in Tap Tap Fish: Abyssrium. Its name is a play on Jell-o, a popular gelatin snack. Its body looks like a Jello mold and gradients from red to orange. It flaps its jelly-like tendrils in a very fast and erratic fashion. It's available during the First Anniversary Event of Summer 2017.
The Jellofish costs 3.000 Cake and requires you to have already collected 30 event fish.
Jellyfish could be based on real life atolla jellyfish.