Cheddar vs tvorog

Cheddar

noun

  • Cheddar cheese. 

name

  • A village in Somerset, England famous for its cheese, and also for its gorge, caves and remains of early man found in them. 

tvorog

noun

  • A soft Russian curd cheese. 

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