bubble tea vs gunpowder tea

bubble tea

noun
  • Sweetened tea with milk and tapioca pearls, often including fruit juice, syrup and other ingredients. 

gunpowder tea

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

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