They are packaged in a red can that pictures a white bowl containing the barnacle balls. It is on a tan background that says reads the food's name in all caps and red text. The food itself is reddish-brown. They can also be cooked or roasted and will become hot and steamy.
Role in episode
Squidward is offered marshmallows by SpongeBob and Patrick, but he decides to eat Swedish Barnacle Balls instead. However, his camping meal is unsuccessful, due to the fact that he has no can opener and SpongeBob and Patrick will not let him go inside his house to get one, so he is forced to eat marshmallows instead.
They are a parody of the famous Swedish Meatballs.
The Swedish Barnacle Balls confirm the existence of the nation of Sweden within the SpongeBob SquarePants universe.