Yes, you can! Just warm it first and then refreeze it. Some may disagree here, but I would never thaw a ham with out cooking it first and then refreeze it.
After tightly wrapping ham to prevent freezer burn, you can refreeze a ham however cured pork products loose flavor & texture changes if kept too long. I prefer to use my foodsaver or Ziplock Vacuum bags and refrigerate cured ham products. That's why luchmeats, bacon & ham are packaged the way they are today.
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