"Gollum-Frodo" was a deleted scene in Peter Jackson's The Lord of the Rings: The Two Towers.
In the original script for the film, Faramir has a vision of Frodo's future, should the One Ring have taken hold of Frodo's soul.
Frodo's transformation into Gollum
Frodo gripped by the Ring's power
Elijah Wood during his makeover into "Gollum-Frodo"