If you can get another pic of the mature fruit, and if possible a twig closeup, I think it'd help tree-mendously! It could indeed be a Pignut Hickory whose fruit an insect had perhaps oviposited some eggs into that caused some freakish hypertrophy, but for some reason I suspect it's some sort of asiatic species, as buddingtree suggested. Also, it's possible that fruit is mistakenly mismatched with the leaves. Devilish ID this has been, IMHO, as Stumper I'm sure agrees.