There are 1:72 scale zombie pirates on Amazon.  Probably not what you had in mind but the only thing I've seen in that scale.  Perhaps a little cutting and trimming and shaping could get you what you want.

http://www.amazon.com/PLASTIC-FIGURES-Zombie-Pirates-figures/dp/B0123D3XQ4/ref=pd_rhf_gw_p_img_1?ie=UTF8&refRID=1S04BVFC9G067CWBQ6RJ

Craig

Do they need to be 1/72nd? I'm thinking you might try HO scale (1/87th) railroad figures. They come in civilian dress and I've seen large boxes of assorted ones online that you can cut them up and modify to your heart's content.

Ok, strike that. I was wondering if you needed them for a 1/72nd aircraft etc- HO scale would be way too small. 

Caesar Miniatures do atleast 4 boxes of zombies in 1/72 scale....Zombies Set 1 - Dark Alliance