cottage cheese vs sour cream

cottage cheese

noun
  • A cheese curd product with a mild flavor that is drained but not pressed so some whey remains. 

sour cream

noun
  • Cream which has been treated with a benign bacterium to turn it slightly sour, often used as a condiment, or a topping for baked potatoes. 

How often have the words cottage cheese and sour cream occurred in a corpus of books? (source: Google Ngram Viewer )