Answer:
What starts with the letter T, is filled with T and ends in T?
They are Dark, and always on the run. without the sun, would be none!
The more you look at it, The less you see.
They are toothy nocturnal immortals.
It's tough as nails, Or soft as snow. People use it for their rink, Some just put in their drink.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.