Can you post the rest of the photos as well? It would help to see what other teams he played for.
There was a Lauri Myllykangas (sure sounds like a "Mully" to me!) who played for both the Knoxville Smokies and the Indianapolis Indians in 1938. The only photo I found of him quickly though was on his 1936 World Wide Gum card, and doesn't quite look right to me for your guy in the snapshots. My eye for faces is not the best though. Seeing other angles of him and any other teams he played for would help:
