blintz vs slapjack

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. 

slapjack

noun
  • A type of pancake, or flapjack. 

  • A simple card game similar to snap. 

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