Yes, you can.
Bait is defined as
Organic substances, other than rubber, wood feather,
fiber, or plastic, attached to a hook to attract fish. Bait includes
insects, insect larvae, worms, dead fish, fish parts, any other
animal or vegetable matter, or scented synthetic materials.
Note: Use of live fish , leeches, frogs, salamanders, waterdogs
or shrimp as bait is prohibited in Idaho, except that live crayfish
may be used if caught on the body of water being fished.