bubble tea vs tapioca pearl

bubble tea

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

tapioca pearl

noun
  • A small edible ball made primarily from tapioca starch; used in bubble tea. 

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