I’ve covered a few tales of the Holle/Hulda/Perchta myth-complex in my translations.

(I see these three as fundamentally the same entity, even if there are major regional variations.)

I’ve covered a few of these tales in my translations.

I suspect that there is quite a lot of overlap with kobolds and household spirits in German folklore.

I suspect that there are quite a few of these in German folklore. I have collected more than a hundred German folk tales of saints and holy people over the last few years, but I haven’t cross-referenced these with the list of canonical saints yet.