There never was and probably never will be as they are the only NFL team without a logo.
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The helmets have been the same sense 1946, and in 1946 no teams had logos on helmets.
Cleveland browns
The Patriots changed the helmet logo in 1992. They went from Pat Patriot to the current Flying Elvis logo.
The Steelers only have one logo because when they originally put the steel mark on the helmets they wanted to see how it looked on the gold helmets and put it just on one side. And later that year they went to the playoffs for the first time so as good luck they decided to change the helmet to black to show the logo better and keep the one side.
The Chargers helmet colors changed in 2020 when they unveiled a new logo and uniform, featuring navy blue, gold, and white as their primary colors.
The Minnesota NFL team is nicknamed the "Vikings". Think of the classic image of a Viking, with the classic horned helmet. The logo on the Vikings' helmets is supposed to look like those horns sticking out. Obviously, trying to do a 2-d drawing of the horns like that leaves a bit to be desired and one has to look at it with a little imagination.