Can you take this feat multiple times?
Nope.
Quoth the rules:
If a character has the same feat more than once, its benefits do not stack unless indicated otherwise in the description.
Toughness
You have enhanced physical stamina.
Benefit: You gain +3 hit points. For every Hit Die you possess beyond 3, you gain an additional +1 hit point. If you have more than 3 Hit Dice, you gain +1 hit points whenever you gain a Hit Die (such as when you gain a level).
(Not indicated in the feat that its benefits stack, so you can't take it more than once.)
Also, I'm going to move this thread to its appropriate forum.
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If your DM is allowing non-PfRPG books, and you're just looking for feats that give you hit points, way back in 3.0's Masters of the Wild there was a series of feats that gave a one-time set of bonus hit points. I don't have my copy with me, but I think they were:
Dwarf's Toughness: Req. Fort Save +5 Gain +6hp
Giant's Toughness: Req. Fort Save +8 Gain +9hp
Dragon's Toughness: Req. Fort Save +11 Gain +12hp
They don't really seem worth it to me, but they were written up back when Toughness only gave +3hp. With a few tweaks, I think they could get up to speed with the newer feats.