All the dinos are in the dino gallery so that you can add them to whatever desktop you want, including mac and windows, etc.
The name of the overarching project is Universal Blue, which covers all of the images. A cosmic image does exist, check it out here! GitHub - ublue-os/cosmic: A Fedora Atomic based OSTree Image with the COSMIC desktop environment. Thanks to Drakulix for initial image. though probably start with a VM as it’s in Alpha.