No. It's an independent community project that uses Fedora as its base. Fedora is a registered trademark of Red Hat, Inc.
Fedora has a predictable release cycle, up-to-date packages, and official tools for building custom images (kickstart, livemedia-creator, Anaconda).
Marsh uses KDE Plasma with a global menu and dock. Pup uses Xfce and is lighter, designed for computers with at least 4 GB of RAM. Snout uses stock Fedora GNOME with no layout changes.
They come from the capybara's world. The About page has more detail.
Requirements are still being defined. Pup is expected to run well from 4 GB of RAM. The download page will be updated as testing progresses.
Yes. All editions — Marsh, Pup, Snout and Herd — are available for download. See the Download page.
Yes. It's a free software project maintained by a community, free of charge.
The Contribute page lists ways to help with translation, design, testing, and documentation.