The 22-year old arrives at the Knights after playing for Northern Hawks, a feeder club for Newcastle Knights.
He’s also had time at Tweed Seagulls, featuring for their under 20s.
Knights head coach, Mark Applegarth said: “I’m really happy we’ve got Harry.
“We had him in line for next year but with a couple of injuries, we thought it was wise to give us a little bit more depth and cover by bringing him in now.
“He’s definitely a player I think will catch the fans’ eyes when he gets his chance.
“He fits our mould of being young and hungry and wanting to prove himself.”
Fraser is available for Sunday’s trip to Hunslet RLFC in the Betfred Championship.
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