Answer:
Fred and Wilma's child, named after a stone.
From tree to tree it jumps and it swings and this furry little fella likes fruits, nuts and seeds. And sometimes people say to “stop ‘us’-ing around.
It looks like it's grizzly but it's actually soft and cuddly. It may be big or small, all stuffed up and ready to be snuggle.
I usually wear a yellow coat. I usually have a dark head. I make marks wherever I go.
When one does not know what it is, then it is something; but when one knows what it is, then it is nothing.
I’m grown from darkness but shine with a pale light. Very round I am and always a lady's delight.