pirog vs éclair

pirog

noun
  • A baked case of dough with a sweet or savoury filling, popular in Eastern Europe. 

éclair

noun
  • A small chocolate-covered creme-filled pastry puff in a general oblong shape, typically larger than the miniature French version. 

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