Julie,
I know exactly what your corndog iron was like in its entirety as I came across one in the mid 80's back east or down south. At only $75 I didn't buy it because my buddy who was looking with me spotted it at the same time and bought it (someone had to give some leeway here). Since then he has traded it to Joel S. for a Santa which, of course, is nowhere near worth what the Wagner iron would be these days.
The iron you have came in one of two frames: Catalog # 1427 was two of your irons in what I think was a frame similiar or identical to the Wagner Twin Waffle iron frame and that's what a c.1927 Wagner catalog says (2 pr. pans, like No.1421-- which is the twin waffle iron). The second version came in a huge frame that would hold either 4 of your irons or 2 of them plus a "fryer pan" which was like a square waffle pan without the grid inside and had two ball joints on which to open the irons along with two opposing coil wire handles with the balls and handles spaced as they would be on two of your double irons placed side by side. The fryer pan would only open and not flip over as would a waffle iron. The fryer pan was not used alone in its own frame nor as part of any other Wagner item as far as I know. The large frame would also hold two fryer pans if you wanted it to but was probably not available that way; only with a pair of the double corn dog irons and the one square fryer pan. The Wagner catalog gives this version Catalog #1430. No mention is given of the frame using 4 of your irons but they would fit that way if you had 4 of the double corn dog irons. Catalog 1431 was the 1430 iron with Gas Stove. The 1430 frame was the same as the frame used on the double twin waffle iron but may not have had the coil wire side handles on the frame but, instead, plain wire handles without the coil on them (judging from the catalog illustrations). In all my years of collecting the iron my friend and I came across in that antique store years ago is the only one I know of. It was in excellent condition, complete, and a massive and interesting piece.
Steve