cliffhanger vs folktale

cliffhanger

noun
  • An ending or stopping point calculated to leave a story unresolved, in order to create suspense. 

  • An outcome which is awaited with keen anticipation, especially one which is delayed for a period of time or which is not known until the last minute. 

folktale

noun
  • A tale or story that is part of the oral tradition of a people or a place. 

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