I agree about Baldr. I recall the god of the sea being Aegir while Njord was god of coves, creeks and such. He was one of the Vanir, father of Freyja and Freyr, and later married Skadi the Jotunn.
I think Njord is associated with the sea, but isn't the God OF the Sea. Aegir was a jotunn though, and was the personification of the sea, I believe. However, all of this is contested because mythology can tend to be confusing, and it doesn't stay the same.
But yeah Njord has nothing to do with that.