The tyranist's thoughts
I have my share of irrational fears. I couldn't claim to be an honest man if I didn't admit that much. Still, it is hard for me to believe that anyone finds frogs scary. And someone must because that is the only way this movie could have been made.
A photographer doing a spread on pollution around a rich man's island is nearly killed by the rich man's son. He is invited ashore for the family party to make up for the reprehensible behavior. If this were a happy, cohesive family, he might actually have had a reason to join them. As it is, I'm surprised it took frogs to kill them when they were nearly at each others' throats from the beginning.
Although it is mostly frogs haunting the island there are a couple snakes and some lizards and even a butterfly that gets in on the action. They were trying to make an environmental I-told-you-so kind of movie. Really, it is just a typically dull '70s creature feature that ends up being especially unimaginitve. I really struggled to stay awake through this one.
I wouldn't recommend it. Not unless you somehow really dig the '70s and just can't find anything wrong with the decade. Then I'd recommend it just to set you straight.

Rish's Reviews
When I was a kid, there were six channels on our television. Three were the networks, two were PBS stations, and there was a cheap independent station called Channel 20. It came in the weakest on our TV, but also provided me with the cartoons and syndicated programs that most impacted my young childhood. It was on Channel 20 that I watched "Casper," "Transformers," "Bewitched," "Star Trek," and "The Twilight Zone." And, as I've mentioned before (probably countless times), every Saturday afternoon at three o'clock, Channel 20 had their "Thriller Theater," wherein they showed a rotating selection of about twenty films, among which were Green Slime! The Legend of Heck House, Godzilla flicks, The Hound of the Baskervilles (a movie I never made it all the way through), and this little masterpiece, Frogs.
Ray Milland is a grouchy, rich, wheelchair-bound patriarch, who complains about all the things wrong with his family, yet wants them by his side on his yearly birthday/July 4th celebration. Sam Elliott is the photographer and naturalist who knows exactly what's going on and what's to be done in any situation.
This wasn't a good movie, by any stretch, but it was somewhat fun, and somewhat interesting. After all, how do you make frogs threatening?* Snakes? Sure. Spiders? Oh yeah. Lizards? Well, I don't find them scary, but the filmmakers did use them creatively. Alligators? Not too tough. Turtles? Well . . .
It also had an interesting premise (though one we've seen time and time again): after having their natural environment messed with by humans, certain members of the animal kingdom strike back, in a deadly fashion. I don't want to waste time getting serious talking about such a silly movie, but we really have damaged the environment and the natural world something awful, haven't we? Just yesterday, I looked out over the horizon and thought, "Wow, what a clear Los Angeles day. I can see for several blocks!" But then I looked up at the horizon, and could plainly see the demarcation line between the pale blue sky and the blue-brown of smog. All so I can drive two blocks to the bicycle shop, and California natives can use their air conditioners when it gets over seventy, and the housewives can drive their SUVs and the men with penises even smaller than mine can drive their Hummers. Maybe the frogs SHOULD come get us.
Whoa, I don't know where that came from. I meant to add my two cents to tyranist's review and ended up talking very little about this movie. Sorry.
*These filmmakers didn't.