I agree with rootman there.
Looks like young 3 prongs - probably first year they had 3 prongs (2 prongers last year).
As a general rule, even though 3 prongs are legal to dig here in TN, I like to leave any that don't have all 5 leaflets on each prong (for digging a couple years later).
I only hunt my spots every other year, and if I had found small 3's like that, I would leave em and come back in 2 years and they would likely be big enough by then to be worth digging.
You definately have found seng though.
Good Luck at finding more and larger more mature plants !
TNhunter