bois d'arc vs horseapple

bois d'arc

noun

  • The Osage orange. 

horseapple

noun

  • The large, wrinkled, inedible fruit of the American tree Maclura pomifera. 

  • A tree of this species. 

How often have the words bois d'arc and horseapple occurred in a corpus of books? (source: Google Ngram Viewer )