Yes. I remember distinctly when I was a kid, my mother would walk into my room, and seeing all my clothes dragged out of the drawers, and piled up on the floor, she’d exclaim “Greesoonga! You slaarvita boy, clean up all this roosk before you step on a lego!”
I forgot, she also says “Greesoonga!” which is supposed to mean “disgusting”. I think that one may also be another bastardization passed from her grandparents to her when she was maybe 5 years old.
She was pretty young when the native speaking grandparents died, so I’m thinking the reason why native swedes seem to understand these words is because they might be very “baby-ish” pronunciation. Like in Japanese where the Chan honorific is sometimes replaced with Tan in moe character names.
Fun note, one of my mom’s grandfathers was actually Norwegian, and the Swedish 3/4 of the family really disliked him. It was apparently quite the scandal, like a black guy marrying a white girl in Alabama in the 1940s kind of scandal. I wouldn’t be surprised if he taught my mom “slå fitta” just to troll the Swedes XD
By all accounts he had a chip on his shoulder and felt that the swedes were always looking down on him.