You are talking about fantasy plants here, so this real-world stuff may not apply, but ocotillo are covered in spiny, long, wicked thorns from bottom to top. Additionally the "sticks" are very brittle and would break very easily if used as a walking stick. I speak from experience, they are totally not worth the effort to make into something you would want to hold. The one domesticated use for the branches I have seen is as a makeshift thatching for a ramada roof to provide shade from the sun.