Stone SpongeBob, also known as Buddy, is the first stone SpongeBob that SpongeBob makes of himself in the episode "SpongeHenge."
It is a replica of SpongeBob made out of stone. When wind goes through its holes, it makes music sounds and attracts jellyfish.
Role in episode
Stone SpongeBob was built by SpongeBob to alleviate his days of solitude to avoid getting swarm by jellyfish, so instead the jellyfish swarm the stone SpongeBob, thinking it is the real SpongeBob due to music coming out of its holes when wind comes through.
Thousands of years later, aliens admire how jellyfish always surround the stone SpongeBobs when wind blows through their holes.