Amelia Island, FL finds

[LXE1234]

Normally I’m just out grabbing shark teeth on Amelia. I’m getting decent at identifying the main common finds, but struggling with some of these odd shapes I see on and off. Hoping for some help learning about and identifying fossils. I’m a fossilnovice, so I apologize if this is just a collection of rocks lol. 
 

[Fin Lover]

A and C look like rocks to me.  B looks like bone or possibly an osteoderm. 

[Shellseeker]

In a pristine state, a Giant Armadillo might generally look like this... Yours is overly worn

[Cris]

Great job with the photos from different angles and labeling them A, B and C. If only ever new member seeking a fossil ID would make that effort, our jobs would be much easier here.

I think A is a rock. B, I believe, may be a worn down piece of turtle shell. C probably are not fossils, but the Amelia Island area does get these things called tilly bones that are actually hyperostotic fish vertebrae. They can often look very similar to what is shown in C (the one on the left side, at least). 

[Fossildude19]

My thoughts for C included phosphate nodules, and tilly bones.

[Fin Lover]

17 minutes ago, Fossildude19 said:

My thoughts for C included phosphate nodules, and tilly bones.

I was thinking phosphate nodules, but the one on the left could be a tilly bone.