So it's always worth getting checked out if you're anxious, but my kid did this and still does when emotionally stressed or over excited and the doctor said it was language explosion/completely age appropriate so I hope that's what you see too
My friends kid went through this and it lasted a month or two. I would wait and see, it’s most likely a developmental thing
My son doesn’t fully stutter but he definitely gets tongue tied when he’s talking 😅