Maclura pomifera

National Arboretum DC
It is a member of the mulberry family, Moraceae. Due to its latex secretions and woody pulp, the fruit is typically not eaten by humans and rarely by foraging animals. Controversial suggestions have been made that it was consumed by extinct Pleistocene megafauna, but these claims have been criticised as lacking empirical evidence.
Maclura pomifera has many names, including mock orange, hedge apple, hedge, horse apple, monkey ball, monkey brains and yellow-wood. The name bois d’arc (from French meaning “bow-wood”) has also been corrupted into bodark and bodock..– Wikipedia

We used to call them brain trees.
Horse high, bull strong, hog tight…