Has an Olympic Hockey (Men) game ever ended 12-2?
Exactly once. On January 1, 1964, Sweden beat Italy 12-2, and no Olympic Hockey (Men) game before or since has ended that way. When it happened it was a scorigami, the first 12-2 in league history.
That makes 12-2 the 75th most common final score out of 99 that have ever occurred in Olympic Hockey (Men). One point away, 13-2 has happened 4 times and 12-3 has happened 2 times.