for url in url1 url2 ..; do git clone $url; done

That’s not really a script but a basic one liner.

Are you accessing these boxes via ssh or using them directly? If it's via ssh, I'd expect that you would already be using the clipboard for copying the names of them rather than typing them out manually, at which point copying `git clone <a> && git clone <b> && ...` would achieve the same thing.