How about "Pockmark!... Freshwater swabs!... Bully!.." or "Amoeba! Bashi-bazouks! Chowderheads! Certified Diplodocuses! Nyctalop! Ectoplasm!"?

"Your mother was a hamster and your father smelt of elderberries!"

I was so disappointed when I tried reading tintin in other languages and found the dear captain was straight up using slurs in those. I wonder whether the english language ones have been edited over the years to remove that sort of thing

æselmassør, sortbørsgrosserer, søpindsvinefjæs, karnevalssørøver!

Findes der en Haddock/Egon Olsen tiradegenerator derude?

Known as grawlix or obscenicon.

https://en.wikipedia.org/wiki/Grawlix

I interpreted that as indicating something was swearing without actually swearing. So, identifying something as swearing that isn't actually swearing.