crowder pea vs marble pea

crowder pea

noun
  • The black-eyed pea. 

  • A type of cowpea, Vigna unguiculata, closely related to the black-eyed pea, but without the characteristic black spot. 

marble pea

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