I always do and it’s always been well received. If I’m going through HR I’ll tell them first and that I would appreciate if they would relay it to my interviewers. I then mention it at the beginning of each round just in case. No one has ever had an issue with it, and it’s way better than having them assume my stutter means I don’t know the answer or something. I also usually ask if it’s okay if I get stuck on a word, if I can just write it out (paper, whiteboard, zoom chat, whatever) so we can keep moving. It’s usually appreciated and sometimes not even needed if the day is going well.