Thanks, Misera, the frontline/house cleaning steps seemed to work. Although it has been almost exactly a month, and the fleas are starting to bite again, I can see them on the pup's stomachs. Amazing how resilient/persistent the fleas are, like cockroaches they will probably be around after the apocalypse. I am going to administer a dose of Nitenpryam today - ordered it back when I first posted - and give the puppies the next round of Frontline tomorrow.
ETA: Man, it is hard to give dogs pills, even with the help of hot dogs. I have little tiny fingers, but I feel like they are logs doing it. Thank goodness this is the last time until next month.
ETA again: W/in 30 ms of giving Fred the Nitenpyram he started acting hyper, panting, scratching like mad, generally being really weird - hanging out in the bedroom by himself, going under the bed, ignoring his dinner. I was pretty freaked out, but apparently stuff like this does happen w/Nitenpyram/Capstar (I googled). It subsided w/in an hour (and then he ate his dinner and Patsy's as well , but it was pretty scary while it was happening. He is fine now, and Patsy (little 6 lb midge, Fred weighs about 30) was fine from the start. Just an FYI if you ever use it and experience these side effects.
Haha yes sorry I forgot to tell you about that. My dog would get hyper too but shes a bit more pudgy now (27 pound corgi) and maybe gotten more used to the Nitenpyram. I give her one whenever we come back from traveling that involves a lot of outdoor/other dog play. She's ridiculously sensitive to flea bites. So for the nitenpyram capsules that are chicken flavored, I just open up the capsule and dump the powder in her food and she eats it up The capstar blob that the vet gave her once she ate it like a treat lol.