Fruit Vendor

No need to advance in the dungeon.

To access Tazavesh you must have completed the Oribos Quests. When this is over, put the dungeon on mythic difficulty by right-clicking on your portrait. The entrance/either the portal of tazavesh is right next to the npc fly of tazavesh (not oribos). When you are in the dungeon, the melon seller is right under the tent. You can buy his melon from him, for the mount 7 days zereth mortis.

Signed Rollrick

All four items needed for the Will It Blend? achievement can be bought on the landing before the first trash pack in Tazavesh.

The Toy Vendor sells Sc'ootie's Favorite Plushie.
The Antique Vendor sells Glow Sticks.
The Fruit Vendor sells Organic Melon.
The Meat Vendor sells Wriggling Tentacle.

The first two are onboard the boat on your right when you first enter the instance. The Toy Vendor is at the front, the Antique Vendor is leaning against the cabin.

The last two are both under the awning on the left ahead. The Fruit Vendor is behind the counter, the Meat Vendor is beside it.

Hopefully this saves someone some time!

He sells the melon needed in Zereth Mortis for the quest "The burrowed bufonid". He is on the left side when you get in before any bosses. He sits right of the meat vendor.