flapjack vs griddlecake

flapjack

noun
  • A pancake. 

  • A bar made of (though not limited to) rolled oats, butter, golden syrup, and brown sugar, baked in a tray. 

griddlecake

noun
  • Any of various forms of small pancake made from a spoonful of batter cooked on a griddle 

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