I never noticed that Spongebob’s shoulders change position on his body when he raises his arms.
So does that mean his shoulders are actually inside his torso, and he just has really long upper arms?
I was unable to find any images from the show where he didn’t have sleeves, so they must be part of his body. Maybe they just slide around on the sides of him.
He doesn’t have bones (except for in gags), so he doesn’t actually have shoulders anyway. He’s just squishy
He is a sponge. He has either no skeleton, or that weird soft one where no piece links to each other.