Answer:
I hide but my head is outside.
Hoofed frolicking.
You can always see it, but it's too far away to touch. Mountains rest on it, and at sea it surrounds you. What is it?
What runs around all day. Then lies under the bed. With its tongue hanging out?
Lives without a body, hears without ears, speaks without a mouth, to which the air alone gives birth. What is it?
What is so fragile that saying its name breaks it?