Not in the mash,but when I was a kid my buddy's mom made these doughy pancakes that would stick to a hook and catch a mess of bluegills! she thought we loved'em.
I can't imaging you'd get much from pancake flour or batter.
But there's a brewery back in the NY town I used to live in that throws a bunch of whole pumpkin pies into the mash while brewing their pumpkin ale.
I’d be worried about oils in the batter ruining my precious foam.
There’s a local cider place that places whole pumpkin pies in the fermenter. Of course, no foam worries w cider.