I regularly use plastic cavemen as a substitute for generic humanoid mook figures. I've got a couple plastic squeezy dinosaur bath toys that I've used for giant lizards - they can squirt water from their mouths if loaded up. Can't wait to spring a spit acid attack on the PCs and just have the line of water ejected be the aoe. I've used a little wooden buddha figurine, plastic vending-machine princesses, homies, pokemon, and winnie-the-pooh-in-animal-costumes toys for miniatures before.
The top of my list and what has been my regular gaming miniature for years now, however, is a miniature from the short-lived Macho Women with Guns line:
A semihumanoid crow, holding a machine gun, wearing a bowler hat, and chomping down on a cigar.
It's the greatest thing ever.