kolach vs puff pastry

kolach

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

puff pastry

noun
  • A light, flaky pastry that is made of alternating buttery and floury dough layers by repeatedly folding the rolled pastry into many layers. 

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