cole vs collard greens

cole

noun
  • Brassica; a plant of the Brassica genus, especially those of Brassica oleracea (rape and coleseed). 

  • Cabbage. 

  • A stack or stook of hay. 

collard greens

noun
  • A form of Brassica oleracea, sometimes called Brassica oleracea var. acephala or Brassica oleracea var. viridis, similar to kale, that is a popular food in the rural southern United States. 

How often have the words cole and collard greens occurred in a corpus of books? (source: Google Ngram Viewer )