The 24-year-old Australian has spent his entire professional career to date at Newcastle, making his debut in 2014.
He has made 44 appearances, five of them coming in 2017.
"His position is one that we identified at the start of the season that we did not have a great deal of depth," said Trinity head coach Chris Chester.
"By bringing in Tyler, it will bring in a genuine competition and add quality to what is already a strong squad."

Ryan Watson was taken to Wishaw General following an incident in Wilson Street on 11 August but later died.
Police have appealed to people in the local community for information.
Det Insp Mark Bell from Police Scotland said: "From the enquiries my team have conducted so far, I am confident that the answer to Ryan's death lies within the local community of Larkhall."
He added: "A young man's life has been taken away needlessly and the family of Ryan deserve to know the truth about what happened to him.
"Ryan had a partner and a young son who will have to continue their lives without him. His mum and dad have lost a son, his brothers and sister have lost a much loved brother.
"I'm making a direct appeal to those within the community, to search their conscience, and contact us with any information they may have because I know somebody knows who did this."
Wakefield Trinity have signed hooker Tyler Randell from NRL side Newcastle Knights on a two-year contract from the start of the 2018 season.
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A murder inquiry has started following the death of a 24-year-old father in South Lanarkshire.