Eric hits a bullseye, right on the mark , Osage orange is a phenomenal tree. Besides quality fuel, it has other superpowers
It's also known as bow wood, reputed to make perfect durable bows for indigenous cultures in the US. Tough, flexible, almost like spring steel
All of the strange green fruit is useful, according to a farmer I know in the Blue Ridge of Virginia. He says it can dry out in a barn or house attic and prevent insects and critters..... flying squirrels, mice, red squirrels........from living indoors. Two or three years of prevention, amazing how our natural world offers gifts every day