Food of the Gods (1976)

Three football players go hunting on an island, run into giant wasps, and one man is stung to death. The survivors end up at the Skinners, where a greedy businessman and a female biologist have come to purchase the rights to what the Skinners call Food of the Gods - a thick white substance that comes out of the ground that is being fed to their chickens.

Whatever this glop is, the chickens have grown to be bigger than an automobile. Other animals and insects on the island are also ingesting it and increasing in size. Thus the problem with the giant wasps and the soon to be problem with the giant rats.

Close ups of cute little rats swarming a Barbie sized camper is adorable not threatening. Then when the real camper is used, they switch to rat puppet heads which are also adorable in a different way. Scary? No, not in the slightest.

So basically you can sum it all up by saying Marjoe Gortner and some cute looking giant rat puppets run around on an island. A businessman sets himself up to be mauled by a giant animal to teach him the error of his greedy ways and everyone panics.