Janna Jungle. Is it Viable?

i just was playing Janna and thought to myself Janna would be an OP ganker. she has a slow, and a knock up thats very easy to land. then a shield so the people in lane can take less damage while dealing more damage with the AD buff. i just tried it in a custom game and although there are somethings to make it better i was able to get blue wraiths and red at 3:00(all thats really needed since you only need to get lvl 3) and full health with 0/15/15 masteries. i started with cloth 6 but had an extra health pot at the end. im not sure if i would still build janna support(probably not) or go AP janna. if going AP the 15 points in utility would not be needed and would make the jungle even faster. once you get to lane i think its unquestionable that the ganks would be better then most top tier junglers. lee sin has a very good slow and can jump to the target but some1 like gp can just eat fruit and its k. you cant cleanse a knock up. udyr has a stun but the knock up lasts just as long and once again cant be cleansed. and once you get level 6 you can use jannas ult to knock people back into your turret etc.

tl;dr dem ganks