Police say the 19-year-old couple got into trouble at Warrandyte North when the water became turbulent and the woman lost control of her grip on the doll about 4.30pm yesterday.
The woman grabbed hold of a tree that was floating in the river while the man stayed with her and they yelled for help.
A passer-by contacted triple zero and police and SES went to the scene.
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A kayaker took life jackets to the pair and the SES attended with a boat and rescued the pair.
They were checked by ambulance officers but didn't require medical attention.
Police say the fate of the dolls is unknown.
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