I have a printed copy of the Stodola Pumpa song, entitled "Walking at Night," as translated by A. D. Zanzig. It's in an old camp song book entitled Sing!, published by Cooperative Recreation Service, Delaware, O (Ohio?), under the logo of the American Camping Association, no date, probably 1940-1960 sometime. It has the melody and a harmony line, with guitar chords. The lyrics are as reported by Sorcha.