Kelp Fries, sometimes known as Krusty Fries or Sea Fries, are a common side dish served at the Krusty Krab. They have had different appearances over the years. They are like French fries but in a Krusty Krab manner. Plus, they are likely made out of kelp or seaweed.
The Kelp Fries look like normal fries. However, they somewhat resemble seaweed with the way they are shaped
Ocassionally, Kelp Fries are not on the Krusty Krab menu.
On some episodes, the quantity of Kelp Fries varies. An example of that is the episode "Greasy Buffons" that the fries are 7 (or 8) in quantity while the episode Kracked Krabs have approximately 40+ fries on the platter. (However, these may just mean that the fries come in different sizes, the small box being a single serving while the large platter is made for a group serving.)
The boxes they are served in resemble those of McDonald's French fries since they are both red and contain the restaurant's logo in yellow letters on them.