No, Elijah Wood was not in the movie "Free Willy". He starred in the 1996 "Flipper".
The 1993 movie Free Willy is a touching story of a boy and a killer whale. When Jesse learns that his beloved killer whale is to be killed by the aquarium owners, he risks everything to free the whale.
The movie was directed by Simon Wincer and starred Jason James Richter, Lori Petty and Michael Madsen. See full cast and crew at IMDb.
On the other hand, born on January 28, 1981, in Cedar Rapids, Iowa, Elijah Wood began acting as a child, with roles in the films Back to the Future II, Paradise and The Good Son. He was later cast as the hobbit Frodo in the blockbuster The Lord of the Rings film series (2001-03), and then returned to play the character for The Hobbit trilogy (2012-14). Wood's eclectic film and TV career also includes Sin City, Everything Is Illuminated, Happy Feet and Wilfred.
See Elijah Wood Filmography | List of Movies and TV Shows at Fandango.