Help with Tree ID Please

Whatever they are we have a bunch of them coming up around here, too.
Mostly I cut them down -weed them out as they are in spots where I don't want a tree to grow ( and they have a fairly fast growth rate).

All of the fruit I saw looked like the picture below and were single fruits. I suspect maybe the fruit on this tree were just too young to have grown into the exaggerated oblong shape I see in pictures on the internet for white walnut (butternut). In contract to the picture below, internet photos look very long and pointy, but those fruit may be more mature...

Doesnt look like the Black walnut we have close though.....To have all the saplings around you you didnt notice piles of black walnuts everywhere? I know my BW are young maybe 10 years old you will get 25-35 gallons of walnuts a year, this year being even more with the rain. Big clusters everywhere and the limbs a sagging hard already!