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I believe all the involved trades are reversed.

IF you both traded for inventory items at the same time (your gift or TF2 / CSGO keys for his gift), then you can bug Steam Support for the return of your own items, and they will. They will probably be grumpy, but with the fact that even trade forums exist on their own site, they will help people scammed through it.

If you traded for the items in the Trade Window, then yes. You can get your items back. If you traded with his "friend" for his items, I mean he said that give the items to my friend, and then you get the gift, then nope. If you traded keys / HB links / Desura keys / Origin keys etc., then you won't get them back

Gifts are safe. If you get scammed with gifts you easy can get items back :) My friend get scammed ,he get game back. :)

I was traded a copy of Rust that was purchased via CC fraud and received nothing back since I gave the guy $20 in BTC.