Answer:
What animal has feet on the head?
I have a powerful bite and live in rivers and swamps. People are often afraid of my big jaws. What am I?
To you, rude would I never be, Though I flag my tongue for all to see.
I am a large mammal that lives in the ocean and sprays water from a blowhole. What am I?
From that which comes within itself, It builds its table on my shelf.
Dry though I may be, I am still a sea.