Indian corn vs flint corn

Indian corn

noun
  • a variety of candy corn that contains chocolate in addition to honey-based candy 

  • a variety of maize in which the kernels are variously coloured, rather than being all of the same colour 

flint corn

noun
  • Synonym of Indian corn (“variety of maize with different-coloured kernels”) 

How often have the words Indian corn and flint corn occurred in a corpus of books? (source: Google Ngram Viewer )