Absolutely!
You do still need to comply with the Mork Borg license (https://morkborg.com/license/), since Cthork is based on Mork, but their license is super permissive. Basically, there's some text you need to put on your rights page, and you can't claim to be their company, but that's the bulk of it.
For Cthork stuff specifically, if your thing is non-commercial, you can just make it, no need to ask me. If it's commercial, ask me first, but I'm not going to say no or ask for a cut unless you're like a giant corporation or something.
Also whatever it is, I'm happy to link it on this page and/or shout it out on social media.