Will unsealed fish in the freezer contaminate packaged food?
In the freezer, things are relatively safe, as pathogens will not multiply given the cold temperature.  So, as long as you remove the package with the waffles and toast, or remove the hotdog package and cook, you will be fine. There is a higher risk for pathogens to multiply on anything that the fish is resting on if you were to remove those items and warm them up slowly (thaw on the counter top, for example). There is also a risk of cross contamination if you have the handle the fish to move things about.  However, the more significant problem with not wrapping the fish is (a) it will dehydrate/become "freezer burned" thus limiting shelf life, (b) it will be a source of off-flavors for other food stored in the refrigerator/freezer, and (c) it will pick up off-flavors from the rest of your refrigerator/freezer.