If you are looking for a South Slavic language version on major streaming platforms, you might find Serbian options:
: A Serbian dub titled Simpsonovi exists and has been aired on B92. The Simpsons (1989) Croatian, English subtitles
: Some users report that Disney+ provides various regional dubs and subtitles, though Croatian is typically limited to subtitles for the English audio rather than a full dub of the show. General Series Info (English Original) If you are looking for a South Slavic
However, there are a few alternatives if you are looking for The Simpsons content in Croatian: The Simpsons (1989) Croatian, English subtitles
Where can I find movies dubbed in Croatian with English subs?