umjetnikog
Umjetnikog is a term that appears to be a portmanteau, combining the Croatian word "umjetnik" meaning "artist" with the suffix "-og". This suffix is not a standard Croatian grammatical ending and its precise meaning or origin in this context is unclear without further information. It is possible that "umjetnikog" is a neologism, a newly coined word, or perhaps a misspelling of a similar-sounding word in Croatian or another Slavic language.
If "umjetnikog" is intended to be a grammatical form, it might relate to a possessive or genitive