Turning Olympic gold into NHL greenbacks was the order of the week, not only for Jim Craig, but also for six other members of the U.S. Olympic hockey team. Center Mark Johnson signed a three-year, $250,000 contract with the Penguins and was given a hero's welcome when he played his first game Sunday afternoon in Pittsburgh against the Islanders. One of Johnson's opponents was Ken Morrow, the Olympic defenseman who agreed to a three-year, $225,000 contract with the Islanders. Minnesota signed Forward Steve Christoff to a three-year, $225,000 contract and unveiled him against the Canadiens in the Forum on Thursday night; the North Stars gave Steve Janaszak, Craig's backup in goal, a two-year, $100,000 contract Sunday afternoon, and that night he held high-scoring Buffalo to a 2-2 tie. Winnipeg signed Center Dave Christian to a three-year, $225,000 contract; seven seconds into his first pro game Sunday, he scored a goal against Chicago. Montreal gave Defense-man Bill Baker a three-year, $200,000 contract and plans to send him to Nova Scotia for seasoning. The dollar figures for all contracts include signing bonuses, and each agreement also includes a "two-way" clause providing for a lower salary should the player be sent to the minor leagues.