spark off vs whip up

spark off

verb
  • To initiate something by providing the necessary conditions. 

whip up

verb
  • To produce (something) quickly, especially food. 

  • To lift or snatch up suddenly. 

  • To beat (stir) (a liquid) quickly so to introduce air and form foam. 

  • To arouse or excite. 

How often have the words spark off and whip up occurred in a corpus of books? (source: Google Ngram Viewer )