A question about blue junipers?

My son and grandkids planted 3 upright blue junipers last fall. They are 4 feet tall. They dropped them into a space almost the exact same size as the root ball so that there was no room to pack earth around them so they put the extra soil somewhere else. They are not experienced gardeners. I did not discover this until a few weeks later when they started to lean in the wind and then sat crooked in the hole. By then it was bitter cold and the ground was almost frozen. They have started to look yellowish on the lower half. Should I replace them? Are they too far gone? They are the Junipers that grow 10 to 15 feet tall and about 4 feet wide.