Au contraire. Bubble tea is from Taiwan, where it can be found on most corners, in many flavors. I have never seen it in Thailand or Vietnam. Lemongrass’s offerings include Thai ice tea flavor, along with green tea and coffee. (Which would lead to the unfortunate phrase “Coffee bubble tea”. The assemblage shivers.)

I would expect that the Cart, who spends much of each session discussing in detail whether something qualifies as street food (including bubble tea, which is a street drink) would want to be correct on this.