I think Woody actually did call his compositions 'folk songs', though they aren't really folksongs according to the 1954 definition. Woody came out of a folk tradition, and he composed songs based upon folk models (for lack of a better term) but his songs are not the product of 'the folk' via oral transmission, etc. Have they become folksongs? Some probably have, 'Philadelphia Lawyer', etc. But he was much more of a commercial performer than some people realize.