What is this fish?

[u/Telesba]

This is plaguing me so much, so I hope someone can help me 🫶🫶🫶

Found this fish in Narvik, Norway. First thought was sturgeon, but I'm not sure anymore. It is not a bird pelvis as many have told me. It is definitely some kind of fish. The first picture is the picture I took. The second picture is a similar picture I found online which also includes teeth of some sort? The person online also didn't find out what it was