Who or What is Tom Bombadil?

[Raynor]

the Ents were before the Elves wernt they

I wouldn't say so:

Originally Posted by Of Aule and Yavanna, Silmarillion

When the Children awake, then the thought of Yavanna will awake also, and it will summon spirits from afar, and they will go among the kelvar and the olvar, and some will dwell therein, and be held in reverence, and their just anger shall be feared

The ents don't come sooner than the elves, but pretty much at about the same time (if not later).