Jawbreaker

Jawbreaker was an item that first appeared in Lick Your Way to Freedom when Four was explaining that the contestant's task was to get recovered characters out. According to the wikipedia page, jawbreakers are sucked or licked (because they are too hard to bite), hence why the characters lick them to free the contestants. However, as shown in the episode, there are other ways to break open one (including Rocky's vomit, breaking it, or just practically eating a huge part of it).

Trivia

 * Vomit can melt through Jawbreakers easily.