Here's what www.netflix.com says about it:
1972 PG 90 minutes
Millionaire Ray Milland kills any animal that moves on his island estate. The slaughter continues even when his family visits the island. Sam Elliott challenges Milland to mend his ways -- but to no avail. That means the swamp critters will have to decide things on their own. For Kermit & Co., it's payback time. You'll laugh till you croak!
Boring!! You can tell it's an old movie, the effects are out of it & the concept was odd. We watched the whole thing tho!!