cottage fries vs french fries

cottage fries

noun
  • A basic potato dish made by pan- or skillet-frying diced, chunked, wedged or sliced potatoes. 

french fries

noun
  • Strips of deep-fried potatoes that have been frenched (cut into strips). 

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