Here are the four tomatoes I just harvested and put in the freezer. I'll probably attempt to sprout their next week. They're from my Galapagos Island cross (which appears to be potentially parthenocarpic by the fact that the stigma stay on the fruits for so long; so, I think it must have crossed with Golden Nugget).
I thawed the fruits and began saving the seeds, today. So, they were frozen for a good long while (much, much longer than the Morelle De Balbis fruits). I intend to dry them before planting. (Not that I think it's necessary for germination, but for other reasons.)
I froze three Brandy Boy (stabilized) fruits, two Burpee Gloriana fruits and four Stick fruits—for a really long time. I finished zapping and set the seeds out to dry maybe an hour ago or so. So, if they sprout (when I plant them), then I'm confident that at least some tomato seeds can sprout after being thoroughly frozen. If they don't sprout, I intend to try a shorter freezing period.
Don't worry, I didn't waste all those tomatoes—and I saved seeds from seven different non-frozen Brandy Boy tomatoes, today, too (but I didn't waste their flesh, either). I cooked up the tomatoes after seeding them (Brandy Boy still tastes pretty good cooked). I don't ferment the seeds—this is because I zap them with three frequencies of a Z4EX instead.
I saved more Burpee Gloriana seeds (not frozen ones, though) one to a few days ago.