Answer:
We are five little objects of an everyday sort. You will find us all in a tennis court.
My first half is normally made of stone, my second is crazy, and I taste sweet when complete.
I can be quick and then I'm deadly, I am a rock, shell and bone medley. If I was made into a man, I'd make people dream, I gather in my millions By ocean, sea and stream.
White fat and fluffy, May even look like a puppy. Seems heavy but is light, Floats about without a worry, But if it turns dark you have to hurry!
The eight of us move forth and back. To protect our king from the foes attack.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?