"Otto Frello (6 April 1924 in Ovtrup, near Varde – 24 March 2015) was a Danish painter, graphic artist, cartoonist and illustrator [...]"

https://en.m.wikipedia.org/wiki/Otto_Frello

More info on the pages of the Varde museum (Google translate link since the English version of the museum gave me trouble on mobile)

https://vardemuseerne-dk.translate.goog/exhibition/otto-frello-fantastiske-univers/?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=de&_x_tr_pto=wapp