jackfruit vs memory root

jackfruit

noun
  • A tree, Artocarpus heterophyllus, of the Moraceae family, which produces edible fruit. 

  • The large fruit from this tree. 

memory root

noun
  • Synonym of Jack-in-the-pulpit (“the plant Arisaema triphyllum”) 

How often have the words jackfruit and memory root occurred in a corpus of books? (source: Google Ngram Viewer )