gunpowder tea vs snack food

gunpowder tea

noun
  • A form of Chinese green tea in which each leaf has been rolled into a small round pellet. 

snack food

noun
  • A food traditionally or commonly consumed as a snack between meals. 

  • Any other food consumed as a snack. 

How often have the words gunpowder tea and snack food occurred in a corpus of books? (source: Google Ngram Viewer )