NJCardFan
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I saw a replay of that scene in Talking Dead, and it appeared to be a concussion grenade. It has a lot less thicker shell than a frag, and has more overall explosive power than a frag, since it's relying on the explosion rather than the fragmentation for injuries and kills.
Yeah but concussion grenades don't explode in that manner and when they do, they certainly don't have the power to send a guy reeling and get impaled on metal let alone blast open a fence door more than 50 feet away. There isn't anywhere near the amount of Comp B there to cause that to happen.