potato chip vs potato crisp

potato chip

noun
  • A potato crisp, a thin slice of potato that has been fried. 

  • One of a batch of pieces of potato cut into elongated cubes and fried; a chip or chipped potato, usually larger than American french fries. 

potato crisp

noun
  • A thin slice of potato that has been fried, typically packaged and sold as a snack. 

How often have the words potato chip and potato crisp occurred in a corpus of books? (source: Google Ngram Viewer )