He was such a beloved figure that when the Wrigley family sold the team in 1981, it was written into the sales contract that Yosh would be guaranteed a job.
To my knowledge Topps has never issued a card for any clubhouse employee. If they did, there would certainly be one for Yosh.
Yosh did appear on several of the Cubs team cards. In several he is easy to spot because he was almost always wearing his trademark white fishing hat. Incidentally, one of his hats was sent to Cooperstown.