Pumpkins! Yes, pumpkins are winter squash. Field pumpkins, like those used for jack o' lanterns, have dry, flavorless flesh. They can be used as baked tureens for soup, but are otherwise best left for carving and decoration. Some varieties, however, can be roasted or turned into soups just like other scrumptious winter squash. Look for French varieties like Rouge Vif d'Etampes, other pumpkins labeled "Cinderella" pumpkins (like cheese pumpkins, Blue Hokkaido, and Red Kuri.
"Sugar pie" and other smaller, sweet pumpkins make for great eating and can be used just like Acorn Squash. The smaller specimens can be hollowed out, roasted until tender, and filled with savory custards or small portions of soup for a fun dinner party treat.
Look for pumpkins labeled sweet, sugar, or cheese pumpkins. You can bake, roast, mash, or puree these eating pumpkins just like other winter squash.