Tiny tadpoles found( spring peepers?)

[SweetApples]

I found egg masses for the larger, medium sized black tadpoles( which I mentioned were newly hatched)...but these tiny ones I only found because I was trying to collect pond water for the other tadpoles I already had. So I did some "net sweeps" and realized I had caught these tiny tadpoles. If they are not spring peepers, they are some other small species.

[UncleChester]

If they are not spring peepers, they are some other small species.

How are you determining they're from a small species? They all start pretty tiny.