I think it would be great. We get spinach on our pizza all the time. We have never had squash, but I think it would be awesome. Why not?
I made some grilled marinated squash last night for dinner. I prepped too much so I did not cook it all. Well tonight I made burgers. I grilled the leftover squash and put it on the burgers. It was very tasty. I will be doing that again I am sure.
Let us know how it works on your pizza. I have no doubt this will not be the last time you try it