Your not assuming i have ill intention are you? :)
I thought the cow toungue spell was only to stop liars and slanders trying to influence other people, NOTHING else and more less freezing out a person's ill intention.
There is no prayer in Judaism that permits a person of the covenant to ask for or permission while invoking hashem to do harm to anyone , we can only pray to remove their evil intention, so a freezer spell to stop a threat is perfect, as long as no other deities are prayed too.
How ever, if the person intends to just do evil and more they will feel instant reversal of their designs, we have a daily prayer during shaharit that asks G-d to destroy them at their path if that is what they want and leave us protected.
I will bless those who bless you and whoever curses you i will curse and all peoples on earth will be blessed through you.?
There are many ETERNAL laws like this.