Druids can indeed charm things. I dont know what level their charm spells are or what level of mobs they can charm.
They came with the new Frontiers release, and are class mastery points. This is under your character slot on your inventory lists..You will now see the character Summary which is your stats. The factions which will tell you how you are alligned with different areas, and your class mastery which will allow you to "buy" spells and stats to up your character with your cm points. These points are gathered through xping and changing the ratio of your cm to xp points under the class mastery on the character list.
There is a much better explaination of class mastery on www.Hodstock.com You can plug in the race and class of your character and learn more about it. They also have a walk through. But druids did receive a charm spell that can be bought with points...To my knowledge and I am probably wrong, its more a novelty item. But hope this helps.