“Strange Nature” (*1/2 out of four) was a congenitally derivative sci/fi thriller about a single mother (Lisa Sheridan) who moves with her young son to a small town where she discovers that deformed frogs in a nearby pond are mutating into murderous creatures that threaten the whole community. Pointless and dull story takes far too long to get going and doesn’t provide enough thrills or scares. Stephen Tobolowsky is amusing as the town’s clueless mayor. Watch “Tremors” or any one of the “Piranhha” movies again instead.