Ideas on this Gulf of Mexico treasure ?

[Dinopaw]

[Tidgy's Dad]

Botryoidal chalcedony?

Very nice. 

[minnbuckeye]

A pharyngeal plate? Drumfish? Here is one a forum member @Khyssa posted awhile back. 

[JohnJ]

@Dinopaw Could you take some sharper images in better light?  I think we are seeing 'divots' instead of 'bubbles'.  I'm seeing an old fire or freeze spalled piece of chert.