I seriously doubt a seized caliper would make scraping and squeaking noises when you step on the brakes. If it's seized it won't do anything when you step on the brakes. And you can easily test it. No need to replace it. If you have the skill and tools to replace a caliper, you can push the piston in and see if it moves. You can also see if the slide pins are free.
If you're unable to diagnose it and you don't want to pay someone else to, test the caliper and replace the pads, making sure you install them correctly.
Just saw your other post. If this grinding started after you replaced the hub, clearly you need to look at what you may have done wrong putting everything back together.
Last edited by dxG6; 12-26-2018 at 03:36 PM.