>>298148Heres a picture of the second one I found today, a few steps away from the other one. I don't think this one was there last week (or maybe up to 2 weeks ago) so it seems to be growing awfully fast.
How sure are you it isn't poison ivy/oak/sumac? If its not that, I guess its safe to let live. I don't know if its invasive or if its a nightshade plant like
>>298143 has mentioned and if that is true, it could potentially be dangerous to my berry patch which will grow about 10 feet (3 meters) away so I'd need to kill/remove/retransplant these things.