Well, if you're open to zombie series then Z Nation is a sometimes campy alternative to Walking Dead. Speaking of, I also like its prequel series, Fear the Walking Dead.

From friends, I have heard that Dead Snow is the ultimate in offensive and campy zombie movies (offensive because the zombies are nazis.) Grindhouse has zombie-like creatures in it, though I don't think they're actually dead. Very campy, very gross sometimes. Features Rose McGowan with a machine gun for a leg.