What is the smooth canoe-shaped hills left by a passing glacier?

The smooth, canoe-shaped hills left by a passing glacier are known as "drumlins." These landforms are formed by the deposition of sediment beneath a glacier, which molds the material into streamlined shapes. Drumlins typically have a steeper side facing the direction of the glacier's movement and a gentler slope on the opposite side. They are often found in clusters and serve as indicators of past glacial activity.