菠蘿 is pineapple, and 包 is bun, so 菠蘿包 is pineapple bun.
Add 蜜 to 菠蘿 and you get the word for jackfruit 菠蘿蜜 (bō lòh maht)
About This Dish
Bun with a sweet crunchy top in a crosshatch pattern reminiscent of a pineapple. Sometimes there is a filling, but it's almost never pineapple - more often custard or coconut.