I can't think of anything I don't currently eat, that I'd want to try, including so-called "junkfish" (e.g. sea robin).
I know jetty guys who kept stargazers for the tail meat, window pane for whatever they can flake off that paper thin carcass. I haven't seen anyone take an oyster cracker but someone must have tried it.
OTOH, I ran into "oyster crabs" when shucking a dozen that came from the Chesapeake, fed them to my aquarium tautog at the time, who loved them. I subsequently found out they're a bay delicacy down south and wished I had kept them. I'm pretty sure some keep mole crabs and cook them up somehow for snacking, as well.