Ming-Na Wen played Fennec Shand in The Mandalorian.
Her first appearance as the assassin and mercenary was in the first season of The Mandalorian. She has so far appeared in two episodes of the second season as Fennec.
Ming-Na Wen is in the midst of an amazing career. Just a couple of highlights include voicing Mulan in the 1998 animated film and playing Melinda May in the TV series Agents of S.H.I.E.L.D. You can see all of her credits on her IMDB page.