I can tell you the font used in these Knights logos for the word 'Knights' isn't a font - it's made purposely for the logos only:
However, the word 'Newcastle' is done in either a font called Futura or one called Humanst521 (well, one of these is the one I always use for it ... if they're not right, then they're bloody close!).
Regarding the Roosters logo, I suppose it depends on which logo you want the fonts for (I have only found fonts that look kinda the same without being exact):
The font I use for the '100 Years' is Benguiat, and just having a quick look now, it appears as though it may be the same font for the word 'Roosters' in the other logo (with an alteration made to the capital 'R').
Are they the only two logos you wanted fonts for? If not, here's a brief list of the other ones I have found/use (please keep in mind, these may not be correct - just the ones I have found to be the closest on my computer):
Brisbane - Copperplate Gothic
Canberra - Swis721 ('Canberra') & ?
Canterbury - Arial Black
Cronulla - Square721 ('Cronulla Sutherland') & ? (possibly a made-up font for 'Sharks')
Gold Coast - Folio BtCn ('Gold Coast') & a made-up font for 'Titans'
Manly - Folio BtCn ('Manly Warringah') & Arial Black ('Sea Eagles')
Melbourne - Folio BtCn ('Melbourne' in italics) & made-up font for 'Storm'
Newcastle - As mentioned at the top
New Zealand - Franklin Gothic Demi ('Warriors')
North Queensland - GeoSlab703 XBdCn
Parramatta - Square721
Penrith - Informal001 ('Penrith') & ? (same font as 'Raiders', 'Sydney' from Roosters logo for 'Panthers')
St.George-Illawarra - Century Gothic (bold)
South Sydney - Arial Black (for the oval logo), or Swis721 BlkCn for the 2008 logo (bunny above the text 'South Sydney Rabbitohs')
Sydney - As mentioned at the top
Wests - HandelGothic
I hope these help you out!