Type of squash is a broad term that encompasses many different varieties of squash. ACORN squash is a winter squash with a hard, dark green skin and sweet, yellow-orange flesh. Crookneck squash is a SUMMER squash with a curved neck and yellow skin. SUMMER squash is a type of squash that is harvested in the SUMMER months and has a thin, edible skin. ZUCCHINI is a type of SUMMER squash that is cylindrical in shape and has a dark green skin.