Absolutely agree. Please get them to the Vet ASAP!!!!
This could be from any number of things that only a Vet can diagnose (NOT an online forum).....Your puppies are clearly in trouble! Your description of symptoms are serious!!!
You need to get these puppies to an Emergency Clinic ASAP.....I'm afraid your going to loose them if you don't seek medical assistance, fast......I do hope they are all OK........Karla