FGG stands for Frog God Games. You can purchase their Tome of Horrors Complete and Tome of Horrors IV packages from the License menu. The stock portfolios for the monsters in those books are what's in the FGG stock portfolios.
Similarly, KP stands for Kobold Press, and the stock portfolios labeled KP are connected to their Midgard Bestiary package.
The update list is available from Help...Pathfinder Roleplaying Game FAQ
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