Did this really easily as a 33 druid.  Just use prowl, sneak up, use ravage (this might be a bit difficult if you dont have the feral instict ability because the ogres have a long detection range) if you are having trouble avoiding them, just wait, and as soon as they turn their back, run up really quick and attack.  Rack up combo points and finish em off with ferocious bite, simple and quick.  Took me about 15-20 minutes.
If you catch an aggro that u cant kill (i got 3 in a row at one point and didnt die) just stomp, rejuvinate, and then regrowth, it will get you enough health 2 finish the fight.