Scarlett joins Hibs on-loan to the end of the season.
The striker effectively replaces Kieron Bowie, who was sold for a record fee to Hellas Verona on Friday.
Hibs boss David Gray commented:"Dane is a player with real talent, fantastic attributes and he will provide a genuine goal threat in the forward areas of the pitch with his pace, athleticism and technique.
"We are delighted to bring Dane into the building and we are all looking forward to working with him over the next six months."
Hibernian FC Sporting Director, Malky Mackay added: "Dane is a top young player with serious potential and is an exciting talent.
"We're delighted that he saw Hibs as the best place for the next step in his career, despite having plenty of offers in England and abroad.
"I would like to thank Tottenham Hotspur for their cooperation and professionalism in the negotiations leading to an extremely smooth process of the loan. We're all really excited to see him in action between now and the end of the season."