Maybe someone with more experience will know which one.
Invasive plants are Earth's way of insisting we notice her medicines. Stephen Herrod Buhner
Everyone learns what works by learning what doesn't work. Stephen Herrod Buhner
not walnut. original pic doesn't have pinnate leaves, but simple leaves in alternate spacing. looks kinda like a persimmon...but i don't know the trees in your area well at all, so it may be a number of things.