Barnacle Chips are nearly like normal chips in Bikini Bottom. You can see a large sign in of the Barnacle Chips in the episode Chocolate With Nuts. SpongeBob says that these chips are good in selling, but they don't taste very well.
SpongeBob: "I can’t understand what we’re doing wrong."
Patrick: "I can’t understand anything."
SpongeBob: "There must be something to this selling game that we’re just not getting. Other people do it, I mean look at that!" (points to a giant billboard)
Patrick: (reads the sign) "'Eat Barnacle Chips: They’re Delicious'"
SpongeBob: "They are most certainly not delicious."
Patrick: "Not the way I use them!"
SpongeBob: "Yet they sell millions of bags a day."