What are drumlins?

They are smooth oval-shaped ridge-like structures composed mainly of glacial till.

It shapes like an inverted spoon with the highest part is called as Stoss End and the lowest narrow part is called as Tail End.

They are formed as a result of glacial movement over some minor obstruction like small surface rocks.

The glacial till gets deposited in those obstructions and the movement of glacier shapes these deposits like an inverted spoon.