I dont have ADHD i have autism but I don’t think stuttering has anything to do with ADHD. even when I am incredibly calm and trying to speak well my speech sucks. When i‘m excited it’s bad of course but stuttering is physiological not psychological because of racing thoughts. If im not mistaken theres even a name disorder for those people who stutter because they are trying to speak too fast and are not breathing correctly. But this is something else. Our stutter might be influenced by our emotional state but not caused by it neither it is a symptom of it. Its like when people tell me to calm down to speak better when i am already calm 😂 thats not what stuttering is about