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I think it may be a dialect thing.if you go to the store,it's not Kroger,but Krogers.I see the same thing now with Aldi.Everyone calls it Aldis
I'd say that is a slightly different case, because I would interpret it as people saying "Aldi's" (the shop that belongs to Aldi) rather than "Aldis" (more than one Aldi shop.) But you could well be right that there's a regional shift in the way that the word is used, as the "Cracker Jacks" version spreads by people hearing it sung that way.
A closer example might be the US use of plural "Legos". In the UK, there is no plural word "Legos", we'd say "some Lego" - each individual part is called a "a [Lego] brick", never "a Lego" (BTW, the Lego company themselves say this is correct!) So whether or not "Cracker Jacks" could even be right depends on whether one individual tasty morsel can be called a singular "Cracker Jack". I have no idea if that is the common usage, or if it varies from place to place.
Also, I wonder if the plural "peanuts" maybe subliminally makes people more likely to make "cracker jack" plural. I don't know the tune of the song, but it could also be that going from "...jack, " to the following "I ..." (sounds odd without a very slight pause to separate the words) might be easier to sing with the "s" in there (slurring the words together then sounds more natural.)
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The first rhymes, the second doesn't.
The second is a form of 'imperfect rhyme' called 'assonance' (same vowel sound), whereas the first is a 'perfect rhyme'.
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