I’ve read that roosters that have suffered severe frostbite can lose fertility. I’d probably favor the one that did not have frostbite for that reason, not because of anything genetic. That does not mean that the other two will certainly lose fertility, just that it is possible.
Then I’d try to determine what it was that allowed them to get frostbite. I’m assuming they are all single combed, Orpingtons are but I don’t know their mamas. The normal cause of frostbite is lack of ventilation. The moisture from their breathing, their poop, and maybe a heated waterer can’t escape and builds up. That can contribute to frostbite. Another possibility is that they were in a direct breeze strong enough to cause wind chill. In cold weather they need a coop with really good ventilation yet it keeps direct breezes off of them. There are different ways to do that but a standard way is to have openings up high over their head when they are roosting. Many people on this forum report stopping frostbite by providing more ventilation. And there are people a lot further south of you that have frostbite problems because their coops are so tight the moisture can’t escape, even when the temperatures aren’t that far below freezing. This link might help with that. The lady that wrote it was living in Ontario so she understood cold weather.
Pat’s Big Ol' Ventilation Page
If it is just on the wattles it I unlikely but possible they got their wattles wet when getting a drink and immediately went somewhere a cold wind hit them. This is one that hardly ever happens. It seems really unlikely that you would have two of them but it’s possible if it is wattles only.