I have learned a couple of languages but the only ones I’m proficient in, other than English, are Irish and French. I’ve spoken Irish since I was young and my stutter in that is the exact same as in English. For French tho I’m less comfortable speaking it so I find it’s generally worse for French. Also, fun fact, Irish doesn’t really have a word for to stutter so to say “I stutter”, you say “Labhraím go stadach” which literally translates to “I speak haltingly” lmao (stad = to stop/halt. Stadaireacht = stutter (noun))