Yellow Junkhopper

Without a doubt the BEST tip I've ever seen on this site. I took the advice I found here and went into the Mechagon instance. It only took 12 resets until I had my Yellow Junkhopper, two achievements, and a new Kelpfin pet!

Got a rare at 47,2 31,2 first kill jumper and after a time the yellow appear in the place in the plump. first kill Jumper in the plump afterwards respawn.

Got one on west coast side, this one was uncommon only though. 

I have never been able to find this on the regular Mechagon island. I went into the raid and it was on the Alliance beach my first time. Thank you for the comments! I would have NEVER looked in there!

I was able to get it AND the dusky snooter as well as two other pets inside Mechagon, just going in and resetting it when nothing there.

I became very tired of searching the island for this pet, haphazardly killing every fleeting frog I encountered, so I went into the instance. After about 10 resets, I found this little guy on the alliance beach and he was mine. I suggest following the previous poster's remarks about getting this pet in Mech. It was a primary.

Four other addition locations of Fleeting Frog (the regular spawn) are on beach next to the fisherman gnome west. Alliance landing point beach. Down SE near Scrapclaw and the Toxic horrors. Due east of Western Spray/Freza on the empty beach. Was clearing out FF myself, till i saw one Yellow Junkhopper only getting killed accidently by random player YIKES. Got the tip to check inside Operation Mechagon, so I went in, and my macro picked up a spawn on alliance beach. So perhaps worth checking.

Saw it also as a secondary in Machagon dungeon.

If you're looking for the pet solo in the dungeon, my luck was as follows: in almost 50 resets I saw 1 Yellow Junkhopper as primary (on Alliance beach; don't go to Horde beach or else you'll be vaporized) and 1 as secondary to a Duskytooth Snooter (next to the trogg area). I also got the 3 wild dungeon pets obtainable solo (as secondaries). The chances to see a pet next to town are low, so keep retrying.

Pretty poor spawn rate, and no real reason for it to be such a rare spawn, spent over a week now, butchering hundreds of frogs but yet to see it spawn.

What a slog. Found mine near 46.5, 30.2. That's where I was standing, it was in the water and the first line pet. I'd been spending some time each day checking pets and trying Fleeting Frogs and nuking every pet and critter in sight. Good luck!

I've been slaughtering so many poor Fleeting Frogs, and still no Yellow Junkhopper for me. I've seen far more FFs in the a.m. hours than in the evening -- wondering if anyone else has noticed this?

Next morning -- Definitely far more fleeting frogs now (6:30-8:30 a.m.) than there were last night. Still curious to know if others are having the same experience. (Still no junkhopper, though...)

Found mine at 48, 38; chilling at the southern tip of the pond in the Fleeting Forest.

i followed this guys video, took an hour but got a green one in the end. :)

https://www.youtube.com/watch?v=0MJ2Ylm4-1Q

Killed the fleeting ones on the west-southwest coast. When one spawned southwest. When he was on low health, but not enough to capture it, i forfeit the battle to change some spells. Afraid to kill it. Lucky for me he came back. Did another try but killed it because of a crit shot. Could cry. Flew to the fishing trainer on the west. And there was another one. Put a Terrible Turnip in slot one and finally got it. Guess luck was on my side :)

If you find one... DO NOT FORFEIT THE FIGHT FOR ANY REASON. We've had this pet 'despawn' twice back into the Fleeting Frog when we forfeited :( 

Mine spawned right by the Horde landing area, as a primary pet. 

I also got mine in the lower part of the zone around 34, 79.  Last night I spent 2 hours killing every fleeting frog in the entire zone, and circling around looking for this frog.  The gravity machine was up so flying around was quicker.  I had zero luck.  Today, I decided while i was just sitting here that I would camp my paladin there and just fish for a bit and kill the frogs that spawn only there.  I stayed there for roughly 30-45 minutes before one spawned finally.

I think I was on the same SW strip of land that Unifairy was describing, but the spawn took a lot longer for me. When it did finally spawn, it was the primary (green quality). Spent a couple of hours beforehand probably zapping the critters, fishing, herbing, and fighting the usual frogs.

I followed Lornaa's advice and went out to 34 79.  I killed off the non-battle pets a few times while fishing and he spawns as a rare lead.  

Found one this morning at 34,79 in the Toothy Shallows, right on the waters edge. Hope this helps.