Bengal gram vs garbanzo

Bengal gram

noun
  • A form of chickpea, or the flour made from it 

garbanzo

noun
  • A seed of this plant; the chickpea. 

  • An edible pulse, Cicer arietinum, of the family Leguminosae or Fabaceae and subfamilies Faboideae or Papilionoideae, with white or purple-blue flowers and small feathery leaves on both sides of the stem and pods containing two to three peas. 

How often have the words Bengal gram and garbanzo occurred in a corpus of books? (source: Google Ngram Viewer )