I have since found it twice, but no pet drop. Just manapearls.
Edit 1: Still haven’t gotten the pet, but I found a few very nice consolation prizes just today.
I was killing a rare and I found a Hippogryph vendor standing there. So, I went to check it out, thinking they sold some kind of mount. Instead, they offered undead Hippogryph pets.
Then when I was looking for a Amethyst Spireshell (which I think I killed six times to date), I notice someone fighting a rare, a King murloc. I forget the name. I dropped down and joined in and I only had time to cast two spells as it was very close to death, but it was enough to give me loot. And I got a red murloc pet. One with both Dazzling Dance and Lucky Dance.
Seems like a pet with useful possibilities to me.
And since today was Squirt day, I was easily able to level up everything.
So, still no Amethyst softshell, but what I did find was arguably much better.
Edit 2: I found the Amethyst Spireshell, but it didn’t drop the pet. According to Wowhead, it only drops about 11% of the time. Still, I lucked out in another way. I found the Raging Algan, and after three attempts to solo it (it recovers it’s self-heal faster than I can recover my interrupt), taking so long, I begged for help, and a 60 level Rogue came to help me.
We whittled that thing down to size in short order, and I got the Budding Algan pet!