Short answers, pulled from the story.
A glacial landform is a landform created by the action of glaciers. These features result from the crushing, abrading, and scouring of bedrock by the weight of accumulating snow and ice over thousands of years.
Glaciers create U-shaped valleys by filling the space and carving a deep trough where a river had previously cut a narrow V-shape. This transformation occurs over thousands of years as the weight of the ice sheet drags embedded rocks and sediments across the Earth's surface.
In New England, the stone walls of farms are built from glacial erratics, which are rocks dragged by a glacier many miles from their bedrock origin. These features include terminal moraines, lateral moraines, medial moraines, and eskers that appear as small string-like mounds left behind as the glacier retreats.
Kettle lakes form when a retreating glacier leaves behind an underground or surface chunk of ice that later melts to form a depression containing water. Tarns are lakes formed in a cirque by overdeepening, while paternoster lakes occur when a stream is dammed by successive recessional moraines.
Erling Lindström advanced the thesis that roches moutonnées may not be entirely glacial landforms and may have already had most of their shape before glaciation. He noted that jointing contributing to their shape typically predates glaciation and that similar forms exist in tropical areas such as East Africa and Australia.