Teething Question

I apologize in advance if this is a dumb question..but can you make frozen formula for teething? I know people always say freeze breast milk and put it in those little mesh teething toys. Is it just breast milk because something in it relieves pain? Or just the fact that it's frozen? Also if anyone has any tips for ways to relieve pain for teething I would greatly appreciate it!! My little guy is only 3.5 months and already teething 😩