Blackish tadpoles are most likely bufonids (toads). In NYS, they are probably either Bufo terrestris americanus (American toad) or Bufo woodhousei fowleri (Fowler's toad).

Its August and after a heavy rain I found tadpoles in a temporary pool in the middle of a parking lot at a park! They are brownish black and plump. Most frogs and toads lay eggs early in the year, and although its full of Bullfrogs I doubt you'll find bullfrogs in a parking lot.