鮮蝦 is fresh shrimp (鮮 is fresh and 蝦 is shrimp), 腸粉 is rice roll, so 鮮蝦腸粉 is fresh shrimp rice roll.
鮮蝦 (sīn hā) is a commonly-used fancy name for shrimp, so sometimes you'll see just 蝦腸粉 (hā chéung fán), but when ordering, you usually say the even shorter 蝦腸 (hā chéung).