Answer:
What tastes better than it smells?
I have a tongue, but do not talk. I follow close, but neither run nor walk. Coupled and hitched, but never married. You couldn't bear the load I've carried.
Flat as a leaf, round as a ring. Has two eyes, can't see a thing.
If I have it, I don't share it. If I share it, I don't have it. What is it?
A precious stone, as clear as diamond. Seek it out whilst the sun's near the horizon. Though you can walk on water with its power, Try to keep it, and it'll vanish within an hour.
You use it between your head and your toes, the more it works the thinner it grows.