Who does the voice for the vlasik commercial?

Currently, it appears that Doug Preis is the voice artist for the Vlasic Pickles commercials (if this is what you're asking).

http://www.dougpreis.com/

A Vlasic voice-over is briefly heard (along with other commercial voice-overs you may not have known he did) with the 'Commercial' button from the above link.

The 'Bio' link also lists some of the ads.

He may have voiced 'Jovny the Stork' when Vlasic introduced it in a TV commercial in 1974 (if the birthdate I found for him is correct -- 1930), but I can't find any confirmation. This news article suggests that Groucho Marx was indeed the voice, with other characters in the commercial imitating his voice --

http://news.google.com/newspapers?nid=1817&dat=19991018&id=w88yAAAAIBAJ&sjid=TaYEAAAAIBAJ&pg=3803,3685030

While this news article says the character 'talks and behaves like Groucho Marx' --

http://www.nytimes.com/2007/05/30/business/media/29adnewsletter1.html?_r=1&pagewanted=print

You might enjoy these other commercials and links --

http://www.vlasic.com/ -- click 'Meet the Stork'

http://www.YouTube.com/watch?v=YXiBgiFzKio

http://www.YouTube.com/watch?v=sGkTZFQKAT4