Answer:
Santa shakes his belly like a bowl full of me
I go in hard come out soft. Blow me hard and I’ll make a pop.
Send poorly behaved children to me and let them sit here. What am I?
I'm a kind of cup that doesn't hold water, but makes a lot of noise repeatedly. What am I?
I’m hard as a rock and as light as a feather. I’m passed on to one another. Poor people need me and rich people have me.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.