I found this in a frozen food industry magazine:
Frankly Foods debuts Coney Combos—full size, Sabrett hot dogs embedded in a pillow of potato knish wrapped in a traditional golden crust. Named after New York’s Coney Island, the hot dog and knish mecca for generations, Coney Combos are fully cooked and ready to heat. They come in Original, Hot ‘n Spicy and Chorizo varieties. Packed two to a 12.5-ounce carton and 12 to the master case, the products carry a suggested retail price of $3.49. "
Here is a blog entry from a year ago, but the company's web site is now gone: http://www.scoreboardgourmet.com/2008/01/coney-combos-sa.html
Some of the Kosher supermarkets in Brooklyn as still advertising them from Steeplechase Foods. http://www.junkfoodblog.com/2005/12/steeplechase-coney-combos.html
I am unable to confirm they are still in production anymore. There is no listing for them in the phone book.