Those are the eggs that will eventually hatch into Dragons. You may be referring to 'Egg Pedestals' which are what you may see commonly around another person island. This is another option to use instead of hatching it into a dragon you keep it as an egg and can display it on your island on top of a pedestal
It varies
You can't maybe you can if you have jailbreak I think........
Lava dragon
This will be a crystal dragon.
Crystal dragon
about two hours
You have to buy it. It is one of the main base dragon.
U should wait in till it's done in the egg.
You can't, you just have to wait the desired time. Sorry
There is a good chance that you will get a evergreen dragon but it is very rare (not impposible) to get a lichen dragon
A storm dragon egg in Dragonvale is formed when a storm dragon mates with a moon dragon or a sun dragon. The egg looks yellow in color with a blue outline. It also has white snowflakes.
There is no dragonvale for PC