Dozens of cartoons have had "characters sell chocolate bars from door to door" episodes, including fellow Nicktoons Invader Zim and Jimmy Neutron.
^ Not to mention Doug. Remember the Bluff Scout Booster Bars episode?
But doesn't the lady bear resemblance the fish who lost weight, the old lady fish (and her mother), and the fish who's famous in memes for going crazy for chocolate (CHOCOLATE!) combined?
I think Chocolate With Nuts was based on that scene in Daria and possibly some others in the episode (only saw this clip). It was more of a coincidence, as Daria and Spongebob are both owned by MTVN/Viacom.
It's not a stretch to say that this is where they got the idea. I have written small stories based off a scene of a show that lasted a few seconds (or few minutes). However it's not really clear if they did or not. And if they did I'm not sure if it would be worth discussing (no offense).
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