cough drop vs gumdrop

cough drop

noun
  • A small, medicated tablet intended to be dissolved slowly in the mouth to relieve coughing symptoms temporarily. 

gumdrop

noun
  • A small chewy candy made with corn syrup, gelatin, and flavouring. 

How often have the words cough drop and gumdrop occurred in a corpus of books? (source: Google Ngram Viewer )