Answer:
I start with T end with T and within me is T.
A little pool with two layers of wall around it. One white and soft and the other dark and hard, amidst a light brown grassy lawn with an outline of a green grass. What am I?
When it comes to me, you go on red and stops on green. What am I?
I lose my head in the morning and regain back it at night.
What force and strength cannot get through, I with my unique teeth can do. What am I?
A little house full of meat, no door to go in and eat.