Allen Swift got screen credit for the Gene Deitch Tom and Jerry cartoons he did voicework for, the 3 with Tom's mean owner as well as other cartoons like "Dicky Moe", "It's Greek To Me-ow" and "The Tom and Jerry Cartoon Kit".
Mel Blanc and June Foray got screen credit for doing "vocal effects" for the Chuck Jones Tom and Jerry cartoons. Laughing, crying, screams of terror, and of course screams of pain. But it seems like there weren't voice credits for the cartoons that were directed by Chuck's animators instead of by Chuck himself. It sounds like Mel Blanc did the laughter of the Devil in "Jerry Go Round", which was directed by Abe Levitow. But he didn't get screen credit in this cartoon.
On to DePatie-Freleng...
Just about all of the "classic" voice artists did voicework for DePatie-Freleng's theatrical shorts: Mel Blanc, June Foray, Paul Frees, Paul Winchell, Daws Butler and Don Messick, as did lesser-known voice actors like Lennie Weinrib, Marvin Miller, Larry Storch, Larry D. Mann, and others. But it seems like they only got screen credit if they talked.
Mel Blanc did a lot of "vocal effects" for the Pink Panther cartoons, including the famous Mel Blanc sneeze, his "sputtering" sound effect that he originated for Jack Benny's Maxwell and later used for Speed Buggy, laughing, hiccups, screams of terror, and of course screams of pain. I've heard the famous Mel Blanc sneeze more than once in "The Ant and the Aardvark" cartoons. And while watching "Roland and Rattfink" on Saturday mornings on MeTV, I've heard the famous Mel Blanc sneeze, his "sputtering" sound effect, and a scream of pain. But I think the only time Mel Blanc got screen credit in a Depatie-Freleng short is in "Pickled Pink", one of the rare Pink Panther shorts that has talking in it.
I'm pretty sure that June Foray did the "vocal effects" of the cuckoo in "In the Pink of the Night", a cartoon I well remember from my childhood. But she didn't get screen credit. She did get screen credit in Depatie-Freleng cartoons in which she talked, like "French Freud" and "Flying Feet' (Roland and Rattfink).
Larry Storch got screen credit in DePatie-Freleng cartoons in which he talked, like "Shocking Pink", "An Ounce of Pink" and "The Great DeGaulle Stone Operation". But I'm pretty sure he did the maniacal laughter at the end of "Smile Pretty and Say Pink", yet he didn't get screen credit.
I guess Chuck Jones was more generous about giving screen credit to the voice artists who contributed to his WB cartoons than Friz Freleng wa.
P.S. There are some George Pal Puppetoons that have screen credit for voicework, like Peggy Lee getting screen credit for doing the voice of the singing harp in "Jasper in a Jam". But I'm not going to tackle Puppetoons because I haven't watched that many of them.