Answer:
A stellar five-Βlimbed sea creature.
What creature starts yellow inside and white outside, then becomes its first five before becoming the whole?
It can be in a hat, Or out of the bag. If you see it you'll be smitten, 'Cause it's fluffy like a mitten.
Which side of a cat has the most fur?
When it was young, it had a tail. When it grew up, it had knees
Lighter than what I am made of, more of me is hidden than is seen. What am I?