I was watching an episode of The Smurfs last night. Considering the way the Smurfs sound, I was surprised at the names that appeared in the voice credits, as some have rather deep voices. They included Peter Cullen, Frank Welker, Jack Angel, Michael Bell, Susan Blu and Alan Oppenheimer.
IMDB has a long list of Smurf voice actors, including more from Transformers and a few other surprises, although I would question the accuracy of the list: it was the voice of Gargamel's cat, Azrael, that prompted me to check the credits as it sounded like Welker, but that character isn't listed, nor Gargamel himself, oddly; also Susan Blu is credited for 1988-89 and I watched a 1984 episode. (She's actually credited, unusually, as Sue Blu rather than Susan.) www.imdb.com/title/tt0081933/fullcredits#cast
I also note from IMDB that Welker played Azrael in the recent film.