1. Probably Solitary Sandpiper, but that tail barring really speaks to Spotted. Both have spots on back. Facial pattern makes it a prob Solitary.
2. Northern Shoveler. Nothing else with that profile.
3. Looks like Mallards in back. Wood Duck in front.
4. Odd sparrow. That is a crazy long tail. Has to be a trick of the eye, or weird angle or something. Any additional pic would help.