As well have you been handling them since you brought them home? If so, stop.
Justine is right, if you have them in the same viv, that may be part of the problem, snakes are not social animals and being housed together is stressful for them...so if they are together...separate them. Being together can also cause a host of other problems...cannibalism...stress related illness...unexpected pregnancy(which if the female is to young can cause many problems itself, even death)...inability to digest food(because they are fighting to get the best warm spot to thermoregulate and digest)...spread illness from one to the other...if one regurgitates you will not know who is sick.....all of these things and more as well as the not eating thing.
Now for the handling thing. When you first get a snake you should not handle it for at least 5 days, this allows the snake to settle in and de-stress after the move. Traveling and a new viv are stressful for snakes, esp for little ones. Give them their space as hard as it is....I know they are so cute and wonderful and you want to handle them, we all do. But the best thing you can do for the health of your snakes is to leave them be for that time period and then try the feed.
Like buzzard said you want to make sure the frozen thawed pinkie is fully thawed and very hot. Run your tap as hot as possible and do just like mentioned above..put in a ziploc and heat, then brain( slit head and back open so that brain matter starts to ooze out), now put your little snake in a very small container, smaller than a sandwich container, make sure it has air holes, and put the pinky in there with it and close the lid tight...walk away and check in 30 min...if they still have not eaten..put the entire container in the viv (not on the warm side)and leave over night. Hope fully your little guy should have eaten. Other things you can do are, put a tea towel over the container so it is dark and your snake feels secure, and dip the pinky in tuna juice just before you brain it. Generally, if you follow this things you should have success.
Good luck and keep us all posted.