Urdutotke provides you dua for stutter of tongue in Urdu and Roman Hindi.
Dua for stutter of tongue:
(ARZ KI AEY MERE RABB MERE LIYE MERA SEENA KHOL DE AUR MERE LIYE MERA KAAM ASAAN KAR AUR MERI ZABAAN KI GIRAH KHOL DE KE WO MERI BAAT SAMJHE).
Jin logon ki zaban men luknat ho to unhen chahye ke SURAH TAHA ki AYAT NO 25 SE 28 tak hamesha parhte rahen INSHAH ALLAH aapki zaban ki luknat khatam ho jaey gi.