devour vs pig oneself on

devour

verb
  • To take in avidly with the intellect or with one's gaze. 

  • To rapidly destroy, engulf, or lay waste. 

  • To absorb or engross the mind fully, especially in a destructive manner. 

  • To eat quickly, greedily, hungrily, or ravenously. 

pig oneself on

How often have the words devour and pig oneself on occurred in a corpus of books? (source: Google Ngram Viewer )