Can someone ID this please

[Mydoghasfleas]

Can someone ID this. Found in the sand.

 

[PicassoClown04]

Freaky, looks like a plant?? Only plants like that I know of are mangroves but I don’t think they grow like that, someone else probably has a better idea

 

[Reefer5640]

Kind of looks like caulerpa to me. Maybe peltata or something along those lines.