They look exactly like normal peanuts. They come in a red and white-striped bag that reads the food's name in the mint-green text, with the stripes in a dark blue outline.
Role in episode
After Patrick is given no choice but to agree that he is the culprit of the incident rather than SpongeBob, he is taken to the Oyster Stadium, where he is chained to a platform in the middle of the stage and pelted with Sea Peanuts by the angry audience for the crime.
However, in the end, it is revealed that the person who caused Clamu distress is Mr. Krabs, who stole her egg, believing it to be a pearl. As a result, the audience throws Sea Peanuts at Mr. Krabs instead.