dosa vs potato pancake

dosa

noun
  • A type of thin south Indian pancake made from fermented lentils and rice blended with water, typically served with chutney or sambar. 

potato pancake

noun
  • A shallow-fried pancake of grated potato and egg, often flavored with grated onion 

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