The Butcher Sisters – Uga Uga Bam Bam Hook?

I've been listening to the band The Butcher Sisters for a while now, but I still sometimes have trouble recognizing their voices because they're often changed or edited. I only know that Alex does the verses and Stroppo does the screams and autotune stuff. I'm still not sure about the hooks (like in "Sunglasses" or "Baggersee"), but I think it sounds more like Stroppo. I'm most unsure about the hook for "Uga Uga Bam Bam" because that voice somehow doesn't sound like either of them. Does anyone know a bit about the band and can clarify this for me?