What should I do if papaya tree is wilted by frost leaves

Just put protective clothing on papaya tree.

In fact, it is normal for papaya tree's leaves to wither after being hit by frost, and no special care is needed. But if you want to take care of them, you should put protective clothing against freezing on papaya tree. In a few days, the withered leaves in papaya tree will fall off and grow new leaves.

Plants that have been frosted will basically wither, but trees are stronger than plants and are not so easy to freeze to death.