Q.Sago palm
We had an unusual freeze in SC that damaged my 3 sago palms. It’s May and 2 of them have new fronds coming out of the top. However the 3rd only has a few fronds that have grown out of the side of the stump. Nothing out of the top. Do you think it’s still alive and just needs more time
Yes, as long as your seeing new growth; give them some time.
I'm listing some articles to help you with care.
https://www.gardeningknowhow.com/ornamental/trees/sago-palm/fertilizing-sago-palms.htm
https://www.gardeningknowhow.com/ornamental/trees/sago-palm/sago-palm-not-growing-leaves.htm