I can remember seeing the sturgeon fisherman below Bonneville on the Columbia using Lampreys for bait in the mid 70s. They were plentiful then and I can’t remember if there was even a limit. I believe they are now protected
Not that I've ever seen or heard of. Off the top of my head, at least for the bait fishing I am familiar with, I can't think of a situation where I'd really feel like trying it.