Farmer Maggot and Tom Bombadil

[Lord of Angmar]

Which would mean that T&G were Ainur. Two riddles solved in one stroke!

Ainur cannot reproduce, so I am afraid that this theory is flawed.

As for Bombadil creating hobbits, I highly doubt it. Bombadil is (obviousl) immortal, as, it can be assumed, is Goldberry. Hobbits are mortal, and while Tom does have quite a connection with life and the natural world, I personally cannot conceive of him creating a race, as did Aule. The strength for the creation of an entire species does not seem in him, whatever other powers he may have.