Question about cooking squash

Is it okay to cook squash whole or do you need to seed them first? 

I bought a bunch of Delica and Buttercrisp squash in November.  We’ve been slowly eating them but I still have several left.  Was wondering if I could put them in the oven whole then clean the seeds out after cooking.  Want to get them processed and into my freezer. 

Thanks in advance.
Gina