blini vs blintz

blini

noun
  • A small pancake, of Russian origin, made from buckwheat flour; traditionally served with melted butter, sour cream and caviar or smoked salmon. 

blintz

noun
  • A thin blin (pancake), filled (often with sweet cheese) and folded, then fried and often served with sour cream, fruit, or a sweet sauce. 

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