what type of squash can i substitute for zucchini in a corn and pasta and cumin seed casserole? TY

For flavor, any that you like, but you'll need to peel it and at least partially cook it before you mix with the other ingredients as they take (much) longer than zucchini.
If you want something which can be cooked with skin on and about same time or only a little longer than zucchini, use Delicata.