baby face vs grin

baby face

noun
  • A face, often chubby, resembling that of a baby; a youthful face. 

  • A person having such a face, especially a young man having a beardless appearance. 

  • A headlining wrestler with a persona embodying heroic or virtuous traits and who is regarded as a "good guy", especially one who is handsome and well-conditioned. 

grin

noun
  • A smile in which the lips are parted to reveal the teeth. 

verb
  • To grin as part of producing a particular facial expression, such as a smile or sneer. 

  • To express by grinning. 

  • To smile, parting the lips so as to show the teeth. 

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