Hi, I have joined the jam and am wondering if I can use Scratch/TurboWarp. I do not know how to use Unity properly without the project lagging.

you should consider using tools like raylib or love2d, as they aren't that laggy and are still pretty fun to play around with

I believe it is. There isn't a official list, but I think what the description is trying to say is; if you know a language; go and make a game for the jam!