Arghhhhh!!!!

They might survive, but they might also decline slowly over a couple of years.
A sign that they're doomed will be slightly sparse leaves, periodic wilting in dry spells and leaves which have curious purplish tints in late summer/early autumn. They may also be slow out of dormancy in future years and, if doomed, they will flower prolifically in a last attempt to reproduce before they die.

Their survival depends on whether the bark is gone in patches, or whether it's all the way around, therefore cutting off the sapflow from the leaves to the roots.

You could try "bridge grafting" to restore sapflow.

Two of the trees have half the way round taken.
But 1 has around 2/3 taken

I didn't know if I had to paint something on to help prevent infection.

You could paint something if you like, but the damaged bark will already have fungal spores on it, blown by the wind.
Sealing of wounds is something that should be done within a short time of the wound being created.

The greatest risk is not from infection, but from the damage to the sap-carrying xylem and phloem under the bark. If the sapflow is damaged, it's like having no blood supply to a part of your body.

If they are not completely girdled, they may survive.
I would discourage allowing them to blossom or fruit; remove blossoms to prevent the plant expending what little vigour it has by giving all its energy reserve to the nectar and pollen in the flowers.

I would also, if possible, prune back the top quite hard if they are still not leafed-out, to reduce the demands on the impaired sapflow.

....and, if it was mine, I'd give them a good mulching to keep the roots moist for as long as possible (to reduce any water stress) and make sure that they get plenty of feeding, but not too much nitrogen because it will grow like mad, then a drought comes along and the damaged sapflow will result in inability to keep those vigorous shoots supported, resulting in stress.
There was a thread about blueberries recently which also had a good bit of chatter about fertilisers.

Since they still have some sapflow, if given good care, they have a reasonable chance. By the end of this season, if well-cared-for, they have a good chance of growing new xylem and phloem and be back to normal (if a bit scarred).

I've brought half-girdled young trees back to normal health and vigour.

are they in the freezer or a new home