There is a German Songbook for Scouts on the web, which has quite a large section with English songs, about 10% of them folk. It gives a good impression what one particular group of German scouts are singing. All notes and link descriptions are in German. But if this does not deter you follow me to the English section of that songbook. Note that not all of their English songs, even not all folksongs, are found in this section. If you want to find all English songs you have to follow their other links. Good luck.

Wolfgang