I have the blue/bronze morph and the bronzing starts fairly quickly.
The first is a pix of Jr, less than a week oow;
The second pix is about 3 weeks oow - notice how the dark color starts increasing and taking over the blue color. He's about 8 months now, but he won't hold still for a pix. His pattern is very nice.
The third pix is his mama. I love the way their coloration changes over time.
green and bronze, blue and bronze and turquoise and bronze are almost undoubtedly the same frog as any combination will breed all colors. so the frog in the last pic is just a "turquoise and bronze" frog, and while its definitely pretty it isnt really an oddball or strange deviation from the normal colors.
as far as the bronze coloring up, you should start to see some color develop in the first 12 months but dont expect anything drastic. they seem to continue to get lighter and lighter with age.