drool vs lick one’s chops

drool

verb
  • To talk nonsense; drivel. 

  • To secrete any substance in a similar way. 

  • To secrete saliva, especially in anticipation of food. 

  • To react to something with uncontrollable desire. 

noun
  • Stupid talk. 

  • Saliva trickling from the mouth. 

lick one’s chops

How often have the words drool and lick one’s chops occurred in a corpus of books? (source: Google Ngram Viewer )