The few times I’ve preserved bait, it was creek chubs. Yes I would store them in the freezer but not before prepping them. The prepping process was to simply salt them down and dry them out a bit, while laid out over a bed of newspapers to absorb the moisture. Much the same as curing jerky.
The drier they get, the firmer they will stay when thawed. Too dry is not good as well as too wet.
I like to wrap them individually in a piece (not full sheet) of newspaper when freezing them. The newspaper absorbs some excess moisture as they thaw, when it is time to use them.
PS, I freeze then whole because I use them whole. If I want cut bait, I cut as desired and just freeze the strips.