That is very true, some experimentation already took place regarding this: Frozenset literals and comprehensions
But it is least used among these as well. e.g. github:
/\blist\(/- 13.2M/\bset\(/- 7.7M/\bdict\(/- 7.3M/\btuple\(/- 2.8M/\bfrozenset\(/- 0.5M
And given the first 4 have literals, their numbers are underestimated, while frozenset is close to final.