Clover is good forage for deer. In this case it is a noun, meaning food.Deer forage for their food. Here it is a verb meaning they look for food.
If we remain quiet, the fawn will continue to forage.It is obvious that some animal has been using my garden for forage.
Forage can mean either the grasses that the cows consume, or the act of foraging, which is how some animals find food in the wilds.
Wild boar forage for food in the woods.
Alfalfa is a great forage for cattle and sheep.