Or just a phony actor? You decide.
In Chapter 13 of The Catcher In The Rye...
...Holden is talking with a prostitute named Sunny in his hotel room. Sunny has taken off her dress and Holden is trying to back out of sex with her, making excuses.
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Sunny sits on Holden's lap and changes the subject...
"You look like that guy in the movies. You know. Whosis. You know who I mean."
"I don't know," I said. She wouldn't get off my goddamn lap.
"Sure you know. He was in that pitcher with Mel-vine Douglas. The one that was Mel-vine Douglas's kid brother? That falls off this boat? You know who I mean."
– The Catcher In The Rye, J.D Salinger / Little Brown
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According to author Peter Beidler, that movie is "Captains Courageous" (1937) starring Spencer Tracy.
Beidler first made the connection in his book A Reader’s Companion to J.D. Salinger’s “The Catcher in the Rye”.
Doctor Macro / Via doctormacro.com
This is Freddie Bartholomew, the boy who falls off the boat in "Captains Courageous"
In the eyes of Sunny, at least, this is what Holden looks like.
Wikipedia / Via en.wikipedia.org