In southeastern seaboard US states, some folks called them cicadas, some called them katydids, and some got the syllables confused and said things like katydeads or similar. Some people claimed the name depended on where you’re from.

But they’re not the same:

https://zippyfacts.com/what-is-the-difference-between-katydi...

I had thought Cicadiads are the waves of cicadas. Turns out people say brood.

I imagine its just that cicadas - when they finally show up by the millions - also die by the millions, and leave little crunchy carcasses EVERYWHERE.

I also have been wondering whether I am out of the loop on some joke...