Someone else asked this question recently. They’re indigenous to Texas, and here in Texas, the fruit is universally called a “horse apple.” The tree itself if the Bois d’Arc, pronounced “bo-dark.” The name comes from the French trappers noting that the local indians made their bows from it.
Just out of curiosity, is it deemed not edible simply because it’s tough? The link didn’t say if it was harmful to ingest. Does it taste bad or make you ill?
I can attest to the fact that the wood is tougher and stringier than hammered hell.
It is/was grown as hedge rows to separate fields in the midwest.
Fence posts made from the trunks last nearly forever. Hard to saw, impossible to split.
Some folks slice up the fruit and dry it to use as cockroach repellents.