fish and chips vs potato crisp

fish and chips

noun
  • A meal of fish fried in batter and served with chips (fried potato pieces), popular throughout the Anglosphere, especially in coastal regions. 

potato crisp

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

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