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M*W: It depends on what PA law says. PA may or may not have a law that specifies the latest date a fetus can be aborted. TX law allows abortion to the 26th week. Different states have different laws on abortion.
I'm guessing that freezer contained fetuses that went over the maximum term, and the doctor may have been "storing" them. It sounds like he hasn't used the fetal remains for anything. Hey, it happens. It's happened to me. There are ways to diagnose how far along the mother is pregnant, and even with several diagnostic tests indicating fetal age and growth, it can be medically misjudged.
I'm guessing again, but I have an inkling that these fetuses may have been born alive. Autopsy would show if that is the case. I suspect that the patients (mothers) never may have known.
Again, it depends on PA laws on abortion, fetal death, etc..