Goblin Parts  

 

Drops (but not from Whelps) at:
-Gob Camp South of Chessboard, 3 Spawns + 1 to the side by the tree.
-Gob Camp near Dagnar's Cauldron entry, 3 + 1 on hill, 2 on path nearby.
-Gob Camp pretty central to map, not far from a Dwarven Bandit camp. 1 at campfire, 2 total in 2 tents
-Crazed Gob Camp not far from PoK Book, 1 Spawn at tree, 1 Spawn at ruin
-Gob Camp east of Kaladim entry, 3 spawns by campfire, 4 spawns total in 2 tents, 1 directly back of camp about 30 "ft"
-Any wandering Goblin

I got about 10-15 per run.

You should start at the Chessboard. The undead drop "Skeleton Parts", which are used just like "Goblin Parts" in Alchemy. These "Skeleton Parts" also drop off the lowbie "a decaying dwarven skeleton", so hunt those too.

"Goblin Parts" do not appear to drop from "Aqua Goblins" by the waterline