Man givin credit for forming the american navy.?

Answer 1

I believe it was Benedict Arnold in Whitehall, NY.

Answer 2

On Friday, October 13, 1775, meeting in Philadelphia, the Continental Congress voted to fit out two sailing vessels, armed with ten carriage guns, as well as swivel guns, and manned by crews of eighty, and to send them out on a cruise of three months to intercept transports carrying munitions and stores to the British army in America. This was the original legislation out of which the Continental Navy grew and as such constitutes the birth certificate of the navy.
A small coterie of men in Congress had been advocating a Continental Navy from the outset of armed hostilities. Foremost among these men was John Adams, of Massachusetts.

Or could you mean................
John Paul Jones ....Richly decorated by both France and the United States, Jones is regarded as the founder of the American navy.