There's no such thing as a frozen ATPL in any ICAO-based licensing system.
It's just a marketing name invented by flight schools, so that students who have spent an obscene amount of money to get a CPL and pass the ATPL exams, can feel better about the loss of their cash and the huge debt they now carry. The victims (sorry, "students") perpetuate the phrase because it makes them feel better, but everyone else knows that all they have is a CPL.