Night_Heaven, if you missed only one mudokon at Abe's Oddysee, I think it is that at start of Stockyard Escape, who gets killed pretty quickly by a scrab. When you go to that screen, chant quickly. Scrab shouts when you chant, so no worries about scrab eating mudokon while you chant.
I might be wrong, too...
When I tried to save all 99 mudokons, I missed that one and I got really pissed off at the Boardroom when I saw the scoreboard (or what is that where you see all saved/killed/remaining mudokons. :P I thought first that that mudokon was impossible to sace. :P