Gelatin Salad is an item that appears in Galactic Hot Dogs Island.
Role in Galactic Hot Dogs Island:
Once you obtain the Gelatin Salad (see below), you'll want to equip it and go to Princess Dagger's Planet.
While it is equipped, go stand under a falling rock. The rock will bounce up and down as long as it's still bouncing on the gelatin.
Use the Gelatin Salad to break the rocks so you can get to Princess Dagger, and use it to break the rock she is trapped into.
How To Get It:
Go to Cosmoe's planet and get the Seed Pod. Go back to FunkeTown and give it to Boba Fleigh (the blue bear). He will turn it into Gelatin Salad for you.