blini vs pikelet

blini

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

pikelet

noun
  • A thick type of sweet pancake. 

  • A thin crumpet. 

  • Any crumpet, regardless of thickness 

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