boba

Reader's Digest ９月号の記事 'Bubble Tea Blows Up' からの引用です。

Classic bubble tea is black tea brewed with milk and sugar, then poured over ice and tapioca pearl (also known as balls or boba; bubble tea is often called boba), and served with an oversized straw so you can slurp up a pearl or two with each sip.

"bubble tea" は "boba" ともいわれるとありますが、辞書に "boba" の説明があるか見て見ます。

・Collins Dictionary: a variety of tea containing balls of pearl tapioca, originating in Taiwan in the 1980s:
・Wikipedia: Bubble tea (also known as pearl milk tea, bubble milk tea, tapioca milk tea, boba tea, or boba; is a tea-based drink that originated in Taiwan in the early 1980s....Bubble tea most commonly consists of tea accompanied by chewy tapioca balls ("boba" or "pearls"), but it can be made with other toppings as well, such as grass jelly, aloe vera, or red bean. It has many varieties and flavors, but the two most popular varieties are black pearl milk tea and green pearl milk tea ("pearl" signifies the tapioca balls at the bottom).

タピオカティーとかタピオカミルクティーは名前を聞いたことがあります。　まだ飲んだことはありませんが。