Leo in N E Illinois
The Professor
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@Leo in N E Illinois et al, could you post photos of your local trees when you get a chance?
Large simple (no serrations) alternate leaves. Bark is smooth and gray. The clump I imaged is young, only the tallest in back had one cluster of 3 smaller than normal fruits.
They are, as Chris said, fly pollinated. And they are self sterile, meaning you need two different clones (trees from different seeds) for pollination. Fortunately, seems any two will do.
If you want a pollination headache, read up on hickories, some 9 different pollination strains, each only compatible with one of the other strains.