You go to actions and press revive. This rarely works. If it revives it used to become a zombie dragon, but they deleted all of them due to some complaint. Now I have no idea what happens. Good luck though. I recommend trying it at exactly the hour or at noon/midnight. Experiment.
To prevent hatchlings from dying, check if they are sick (view them and read below) and check the guide here for cures: This is for hatclings and eggs:
http://dragcaveforum.technoized.com/index.php?showtopic=3931
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If you mean to get a green dragon pet, you are required to have 99 Summoning.Once you have this level, kill green dragons - eventually, one should drop a green dragon egg. Take this to an incubator in either Taverley or Yanille; when it hatches, you will have a green dragon hatchling, which will mature into a baby green dragon. Baby Dragons do not fully mature into adulthood in RuneScape.All four chromatic dragons (green, blue, red and black) drop eggs that hatch a dragon hatchling. Metal dragons do not, nor does Elvarg. Hope that helps. :)
If you mean the friend area called Dragon Cave, these are the Pokemon that will live there when recruited: Bagon, Shelgon, and Salamence.
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You can't get eaten by a sea dragon in Hazy Maze Cave. Nintendo just want to scare kids by putting the warning sign in the cave.