SpongeBob ice cubes appear in the episode "The Krusty Sponge."
Role in episode
The SpongeBob ice cubes are first seen after Mr. Krabs shows them off to Squidward among the other SpongeBob-themed products for the Krusty Sponge. However, they quickly melt in Mr. Krabs' claws, to his disappointment. Mr. Krabs then cleans out the freezer to put the ice cubes in it.