Wildlife Spotting

I am sorry if I have placed this in the worng category, I could not find a tab to upload mystery finds, please let me know if it needs to be placed elsewhere. This was found in my backyard in west central Florida, no body just the skull. I thought it was an iguana at first but the large spinous processes don't fit the images I have seen...does anyone have an idea? I still have the skull and can take other pictures if needed. I am thoroughly perplexed.