Can always look here to find calorie density of specific food
https://cronometer.com/They do count as starch BUT winter squash a lot less calorie dense than potatoes--
White potatoes about 427 cal/pound
Butternut squash about 182 cal/pound
Spaghetti squash, the winnah and still the champeeeeeen at 141 cal/pound
Summer squash about 1/ that averaging 77 cal/pound