Answer:
What's at the head of an elephant and at the tail of a squirrel?
It breathes fire in fairy-tales
I am green and ugly and come out at night with a crumple old broom. Who am I?
What is black when it is clean and white when it is dirty?
What can you blow up and keep intact?
Born in the ocean and white as snow. When I fall back to water I disappear without a trace.