Freezing beer creates a chill haze (protein haze) that makes the beer cloudy. If the keg has thawed, freezing probably does not cause your foaming issues now. The problem with beer is the colder it gets the more co2 it retains.
Can you buy a smaller keg and tap it to see if it's the keg? Not promoting over-purchasing, but it will give you an answer right away.
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