I do (or did before the depression) a lot with batteries.
Yes, there is a chance, a good chance that they will not recover.
But, that is by no means a certainty.
Unless you want to scrap them, take them to some place warm and put a low rate charge on them for as long as you can stand. If they are going to recover, surprising them with a high charge rate may just piss them off so much that they quit.
Do not try to charge them in parallel as one may be damaged and it will prevent the others from charging as they need. If you have to time share the charger that will not be too bad.
WARNING - Put the batteries in a known water tight and acid proof tub or box. They may have cracked the case and you have to be careful until you are certain.
There is also a chance that a cell divider has been breached. This will cause a battery to look good buy be the wrong voltage (like 2.2 volts low).
I wish you luck.
A lifelong waterman and his bride going dry places for as long as the fuel money lasts.