You are correct about the greenish cast on the breast band, and also the top of the head. The lighting on the bird is very poor. You may also notice that the belly has a yellowish cast to it, and it should be totally white. I think the green we are seeing is either due to the lighting, the post processing or even a slight color variation.
Last year there was a yellow Northern Cardinal that was seen. There are some House Finches that normally are red, are yellow.
The male doesn't have a belly band. So this would be a male juvie.
Another way of looking at this is, there have only been four species of kingfishers seen the the ABA area:
Belted, Green, Ringed and Amazon Kingfishers. The Green has wing bars and is seen in Texas and the southern tip of SE Arizona. The Ringed has a totally rufous belly and is seen in Texas. The Amazon has only been seen in Texas (I think two but could be three records), and is green. The Belted winters in Florida and is very common. So if a kingfisher is seen in Florida, the chances that it is not a Belted Kingfisher is very highly unlikely.

I'm not sure what constitutes an expert. However, I've been birding for over 20 years, and have seen over 300 kingfishers. This is not a "blended kingfisher." Both the male and female Belted Kingfishers have slate blue breastbands and white bellies. The female has a rust belly band. Juveniles resemble the adults but have rust spotting in the (blue), breastbands.
This bird is typical example of a juvenile Belted Kingfisher.
Sibley's Guide to Birds, and National Geographic Field Guide to the Birds of North America can support the above statement.

This is not a Ringed Kingfisher. Ringed Kingfishers are huge (bigger than a Fish Crow), have a rufous breast, and there has never been one documented in Florida. The bill is much larger on the Ringed than on the Belted. The range for the Ringed Kingfisher is the lower Rio Grande Valley in Texas and Mexico. Occasionally it is seen north of that, but still in the southern half of Texas. This is a typical juvenile Belted Kingfisher. Belted Kingfishers over winter in Florida and are quite common there.

Ringed Kingfisher

Thank you

I've seen 35 species of butterflies in my yard.

Thanks

Thanks Mike

Backyard Butterflies

Black Swallowtail


Black Swallowtail


Cloudless Sulphur


Giant Swallowtail




Monk Skipper


White Peacock


Female Cloudless Sulphur laying egg

Actually, four species of Kingfishers have been seen in the ABA area (birding North America). The fourth, the Amazon Kingfisher has only been seen twice.
This is a Juvenile Belted Kingfisher. In many species of birds the juvenile male and female look alike, as in this case.

Like others have said it's a juvie Northern Mockingbird. Thrushes don't have wingbars, which this bird has.

Don't see any Monarchs here. Top pic has Eastern Tiger Swallowtails. Second pic Eastern Tiger Swallow tails and a Spicebush Swallowtail. Last pic is a Comma.

Mournful Sphinx Moth (Enyo lugubris), in the yard last night.
Nikon D500, 300mm lens, with flash.

(Download)

Mormon Frits have a white fringe.

Thank you Judy

Why do you find it so interesting?