I prefer braided cotton rope myself- & actually did spend many years tying myself up before losing interest. If you throw the rope in a washing machine before use, it softens it somewhat.

Wrap the rope neatly, each strand next to each other, firm but not tight. Then tie a reef knot & cinch it up. Practice makes perfect.

You can also buy cheap leather collars from pet shops or discount stores.

I wouldn't even know what a frogtie is, but my girl says to sit on a cushion.

Just for the record- there's nothing wrong with tying your wrists- just make real sure you can get free....