When it comes to those vintage comics Wulf is one of the go-to guys on this forum. But as far as I know even the most esteemed archeologists here have not identified the artist who did the 'fiends'-serials with the exception of the artist who took over the final serial, called 'semaij'.
The pictures above are from the 'night of horrors' books, originally published in the 1950's, drawn by joe shuster. And, believe it or not, joe shuster - along with a fellow artist jerry siegel - actually created Superman in the 1930s and had to resort to jobs like this to pay for rent. Until fellow artists publicly shamed dc-comics into paying royalties to superman's creators.