Pineapple cakes, small butter shortcakes with a pineapple filling, are a Taiwanese specialty. The airport shops in Taiwan are packed with pineapple cake gift boxes), but you can find them in Chinese supermarkets and bakeries (I like the ones from 85 degree cafe).
鳳梨 is pineapple, and 酥 is pastrypastry), so 鳳梨酥 is pineapple pastry.