Can previously frozen scallops by refrozen?

No, it is not safe to refreeze previously frozen scallops.

When you freeze scallops, the ice crystals that form can damage the cell walls of the scallops, causing them to lose their texture and flavor. If you refreeze the scallops, the ice crystals will form again, causing even more damage to the scallops. This can make the scallops mushy and watery, and can also make them unsafe to eat.

In addition, refreezing scallops can increase the risk of bacterial contamination. When you freeze scallops, the bacteria that are present on the scallops will be frozen along with the scallops. However, when you refreeze the scallops, the bacteria will be able to grow again, and can multiply to dangerous levels. This can make the scallops unsafe to eat.

For these reasons, it is not safe to refreeze previously frozen scallops.