pick at vs scoff

pick at

verb
  • To pick on or repeatedly criticize (someone). 

  • To touch, grab, handle, or pull tentatively or gingerly, using a utensil or one's fingers. 

scoff

verb
  • To mock; to treat with scorn. 

  • To eat. 

  • To jeer; to laugh with contempt and derision. 

  • To eat food quickly. 

noun
  • A derisive or mocking expression of scorn, contempt, or reproach. 

  • The act of eating. 

  • An object of scorn, mockery, or derision. 

  • Food. 

How often have the words pick at and scoff occurred in a corpus of books? (source: Google Ngram Viewer )