Truffle/Shuffle/Chuckle/Kerfuffle do not rhyme with muffel.
Not with the German pronounciation of Muffel. The u is pronounced like the oo in “good” so it’s closer to something like Moofel.
People who like loud cars: mufflermuffel
Guy dudes: muffinmuffel
Ich bin ein Morgenmuffel.
So people who insist on modifying the exhaust on their cars or bikes to make them louder and annoy everyone around them are Mufflermuffel.
And when you tell a grouch to stop complaining you’ll be a Muffelmuffler.
I hate being confused. Am I a bafflemuffel?