If I can't find acorn squash, is there something else I can use?
Acorn squash is a type of winter squash, the kind with hard, thick skins. It is dark green with orange spots, and is shaped like an acorn. Although you can sometimes find it (as well as other winter squash) all year long, it's really at its peak from early fall through the winter.
Recipe: Roasted Winter Squash