External, as in totally on the outside, not under the valve cover?
If so, then the coolant won't go into the oil, but it will leak to the outside, which is still not good. It might could be repaired, but unless it's something rare and impossible to find or very expensive, replacing it would be my preference.
But...
Freeze cracked engines freeze from the bottom up. It is rare for a head to crack and the block to not also be cracked. Blocks can crack internally, which will leak coolant into the oil, but not leak externally.
So if the engine has been frozen, don't assume that just the head was cracked, could be other hidden damage.
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