There's plenty of times I've deliberately used a made up word that onomatopoetically just fit better. See? It just works.
I absolutely know when I'm doing it, and it's not a confusing/conflating of two words situation. I see it no different than when people say any new phrase like how people just say "bet" in a way that has absolutely nothing to do with the word's definition. At least what I'm doing still uses the meaning of the pormanteau's base words appropriately rather than just using a word randomly because it's hip
I actually LOVE making up words that fit. it's a little side game i like to play.
sometimes language has gaps. sometimes it's worth it to just invent a word to convey meaning.