You're going to need armour and high combat stats. You're not going to kill a frost dragon with a bronze dagger and your rubbish bin lid at level 3. Sara Brews are recommended and a decent weapon like a Barrows weapon or even a Godsword. An Abyssal Whip is not recommended but it can be categorised as a decent weapon depending on the enemy. I'm not an expert at frost dragons because I buy the frost bones, I don't kill them for it.
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The best monster to kill in Runescape would be the King Black Dragon.
If you mean as a pet, there is armored frost dragon which is now rare but was dropped from the frost dragon on mount frost or the armored baby frost dragon which is also now rare but was the reward from the quest Turn Dracolich into Dragon. If you mean how to get to it, then that too is rare but was located in Ice cave (/join icecave) or Mount Frost (/join mountfrost).
Corporeal Beast, Mithril Dragon, Kalphite Queen, King Black Dragon, Tormented Demons, Chaos Elemental.
yes, but only one and that's Elvarg from dragon slayer other than that nope
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