In any language, any one of us has certain words or phrases they like to say.
For me, in English, that includes “bedazzled” and “thingamagick” among others.
Howrver, is there some kind of overarching expression for these words? I can’t think of anything in English or my native German, and a quick Internet search didn’t find anything.
Sprachspaßwort sounds like something straight out of a law or industry standard which I guess that makes it heterological.