HFF autor de HFF Whirly Whorl
HFF Whirly Whorl is entirely based on a specimen of Whitestone Scrawl as published in an alphabet book by the late Dan X. Solo. Based on how it looks, the original is likely photo/film type. A wild guess is that it might be a Filmotype. Dan Solo used many Filmotypes fonts in his books. However, Dan Solo never mentioned the original publishers of the fonts he included in his books.
Nick Curtis also did a digitization of Whitestone Scrawl. In fact, Nick Curtis did it first but I wasn't aware of it. He likely used a different source for his font.
BTW I have not created a font using an existing digital font as a source.