fruit ice vs hoar frost

fruit ice

noun
  • Synonym of ice (“frozen dessert made of fruit juice, water and sugar”) 

hoar frost

noun
  • Originally, any frozen dew forming a white deposit on exposed surfaces. 

  • Water vapour which has undergone deposition or desublimation (“transformation directly into ice crystals without first turning into liquid water”) when the air is cold and moist to form a white deposit on exposed surfaces. 

How often have the words fruit ice and hoar frost occurred in a corpus of books? (source: Google Ngram Viewer )