No, it's most certainly NOT what you're thinking. I hope.
It's just that there's this certain TV show that occasionally uses bits and pieces of the German language.
However, since the show is from the US, everyone speaks English. Well, most of the time.
Which...
...doesn't make things easier for the poor cast members who have to pronounce names of Wesen (See? German. Again!) here and there. (Not to mention they should keep in mind what kind of Wesen they're talking about.)
Anyway, there was this lovely, entertaining tweet with a much too short clip of the guys trying to do just that:
"Name that Wesen"
- with the cast of GrimmGo on! Look at the clip. You know you waaa--aant to... :-)))