You've probably already read it, but just in case: Appendix A in ROTK has a pretty good account of Arvedui's doings with the snowmen. Apart from that I guess the only other sources would be non-Tolkien, like David Day's Tolkien Bestiary or maybe encyclopaedias on the net like the one here at the Barrow Downs.
...uh, and I think it was the harpers who sang about Gil-Galad. Not sure what the harmers did to him!
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But Gwindor answered: 'The doom lies in yourself, not in your name'.
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