The Kings of War army lists give some good opportunities for this. If you're talking armies of human-sized monsters, there's several stock armies (herd or orcs comes to mind) where rabble of mixed monsters could work fairly well within the existing stats.
For larger-than human monster hordes, there's ogre army lists.
For including large monsters in a regular list, There's a fair number of "Monster" profiles in each army that would cover most monster types and there are ally rules so you could mix a bit to get the profiles you need.
As mentioned above, Dragon Rampant is a good option, particularly if you want to stay closer to the Platoon size battle. The profiles are even more generic and minis-agnostic than KoW, so you can put most anything into a unit pretty easily.
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