lick one's chops vs look forward to

lick one's chops

verb
  • To anticipate something eagerly. 

  • To use one's tongue to remove moistness from the sides of one's mouth, as when salivating or at the conclusion of a meal. 

  • To look forward avidly to eating something. 

look forward to

verb
  • To anticipate, expect, or wait for, especially with a feeling of approval or pleasure. To be excited or eager to. 

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