soursop vs sugar apple

soursop

noun
  • The tart, spiny, yellow-green fruit of this tree. 

  • A small tropical evergreen tree, Annona muricata. 

sugar apple

noun
  • Sweetsop, Annona squamosa, a West Indian tree or its fruit. 

How often have the words soursop and sugar apple occurred in a corpus of books? (source: Google Ngram Viewer )