How long should you cook a frozen ham?

If it's a fully cooked ham, then really, you are simply bringing it to a thawed state and then warming it. So...probably 250-275f until it's up to room temp throughout. Then crank the oven to 350f to warm. If you are using a glaze, that would be the time to apply it. If this is a raw ham, this would not be a safe thing to do.