At least marshmallows are an honest food. "Hey man, clearly you can see I am a glob of processed sucrose and other simple carbs and flavors, so you can pass judgement about how much you can eat of me before you've reached your recommended caloric intake. And I'm fluffy, so I fill your stomach a bit faster than ingesting pure sugar! You can add me to other stuff if you want, or just eat me pure if that's your thing. Sure I'll spike your insulin into oblivion, but that's what you can expect of me if you just look at me, so you're warned! Otherwise I'm a fun friend!"
I won't even let Hot Dog talk here because he's a dirty, dirty liar. He pretends to be a tasty traditional vienna sausage, but he's filled with low quality leftovers from meat processing and pure, unfiltered hatred for the good taste of mankind. Don't be fooled: he might get your umami tastebuds tingling, but he and his henchmen of ketchup, mustard and bread will get you at least as much, if not more carbs into your system than your dear honest-to-god friend marshmellow. Hot Dog is just kinda there to screw you and your liver, fat cells and pancreas over once you're at your most vulnerable.
I'll make it abundantly clear. Do not trust a Hot Dog. It will disappoint you in your nutritional needs and it will disappoint you in the fight for Splatfest.