smooth talker

Translations
льстивый говорун
He's such a smooth talker, he can convince anyone to agree with him.
Он такой льстивый говорун, что может убедить кого угодно согласиться с ним.
Definitions
A person who speaks in a charming, persuasive, or flattering way, often with the intention of convincing others or achieving their own goals.