I wonder about this sometimes because you can append “huh” to an English affirmative to make it into that meaning, as in “yes-huh”. The questions I’ve been asking myself is whether such a phrase is one word or two. Is it the same word as “yes”? But even still, it’s not allowed to be used by anyone wishing to appear mature or professional, so it doesn’t exist in every lect of English, which I suppose makes it less of an “English” word as such.

Swedish has the word “jo” which means the same as “doch” here, but it’s different in that it doesn’t also mean “but”. I feel like it’s most often followed up by a clarification of the supposed truth rather than left as a single word. Picturing it by itself has me feeling frustrated like the speaker is only answering as shortly as possible and otherwise ignoring me.