kolach vs éclair

kolach

noun
  • Type of pastry that holds a portion of fruit or cheese, surrounded by a puffy cushion of supple dough. 

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 kolach and éclair occurred in a corpus of books? (source: Google Ngram Viewer )