I've seen several different spellings of this, most recently "cacho" and "chagcha," but when I asked the Andean I bought one from, it sounded like he was saying, "chyakchas." I've also seen them called "Uñas" which means toenails.
Yes, fainting goats have a genetic disorder which causes their muscles to freeze when they are startled. This usually causes them to fall over. It can happen when they are afraid or excited and it is...