I would try tube feeding them warmed formula, I cant tell you how to do it on the internet, but sometimes it is the only way to save puppies or kittens like this. It is a lot of work, but can save their life. If you make it to the vet, have him mark a feeding tube & show you how to do it, it is simple once you are shown how. But this gets weak puppies over the hump of not nursing.
Good luck
Good luck