gungo pea vs pigeon pea

gungo pea

noun

  • Pigeon pea. 

pigeon pea

noun

  • The edible seed of this plant. 

  • A tropical African plant, Cajanus cajan, formerly Cajanus indicus. 

How often have the words gungo pea and pigeon pea occurred in a corpus of books? (source: Google Ngram Viewer )