This Acorn is sprouting, if it was in a favorable site (preferably not in a parking area as this one was) it could grow into an oak tree. Many acorns never have a chance to sprout, they either get eaten by squirrels, deer, turkeys, bears, or birds or they are eaten from the inside by acorn weevils.
grow in large brown pods during the summer, they split open and fall to the ground in the fall. Some people carry a buckeye in their pocket for good luck! The nuts are edible to some animals, but are poisonous to people, goats, and cattle.