mountain apple vs pommerac

mountain apple

noun
  • The Malay apple or pommerac (Syzygium malaccense). 

  • Used other than figuratively or idiomatically: see mountain, apple. 

pommerac

noun
  • The edible fruit of Syzygium malaccense. 

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