Can confirm that the Enormous Bullfrog is indeed a superb loot pinata.
He drops BOE blues in my experience at a rate of roughly 9 every 10 runs, the 10th being a frog pet.
The draw backs,
The wonderful folks over at blizzard have decided to gate the instance, no skipping bosses.
RFK is large, with the first two bosses requiring you to double back I advise using a shaman for this, Ghost Wolf FTW!
He has a large pool of potential BOE blue drops, most of it worthless.
This is the same hell hole we had to farm for pugilist bracers and avenger armor and rare spawns back in the day, many of us have seen it far to many times already!
The advantages
This is without a doubt the fastest way to farm BOE blues, nowhere else offers anything like a 90% drop rate on them.
No competition whatsoever for drops/chests
Other items useful to 29's drop such as health pots and sharp claws/large fangs from various mobs while farming, it is also the right range of dungeon for the rare bis greens such as resilient tunic, so even tho you only really care about one mob the trash is not a complete waste of time.
You can run it while watching a movie/pornz.