Fremantle have used their two pre-season picks to recruit 201cm South Australian Jack Hannath and redraft Jessie Crichton.
They also picked up forward Matt Taberner from Murray Bushranges and versatile powerhouse Alex Howson from East Fremantle in the rookie draft.
And NSW scholarship recruit Craig Moller was officially added to the rookie list with selection 51.
West Coast recruited Subiaco's Callum Sinclair and Melbourne's Jamie Bennell in the rookie draft after opting against taking back Mark Seaby.
And there was good news for Claremont's Sandover Medal winner Kane Mitchell, who was picked up in the rookie draft by Port Adelaide.
Ruckman Hannath, 21, who is at the Central Districts club, can also play as a key defender or forward and has the ability to drift forward and kick goals.
Fremantle had already committed to re-signing Crichton, whom they originally recruited with pick No.48 in the 2009 NAB AFL Draft.
Fremantle cut the young Tasmanian to make room for this year's draft crop. He played four games in his third season.
“We’ve added height to the list via the national, pre-season and rookie draft,” Dockers general manager of player management Brad Lloyd said.
“Bringing in Tanner Smith through the national draft was a good start, and then we took Jack Hannath, who is a ruckman, and two tall forwards in Matt Taberner and Alex Howson.
“So there is some good size and athleticism there.”
Hannath, 21, had been training in Darwin with Melbourne in the hope of being selected in the rookie draft.
“Jack has come through the ranks and has become a really good elite player this year in the SANFL,” he said.
“He is a good size ruckman who will fit our list really well with Aaron Sandilands, Zac Clarke, Jon Griffin and Craig Moller.
“(Taberner) came down here for a week of pre-season training and his endurance was up with our top runners.
“He is a nice left-footer and we’ll develop him as he learns the game.”
Lloyd said Howson, who kicked 57 goals at colts level for East Fremantle, was an athletic forward with good speed.
“He’ll lead up forward and can use his speed running back toward goal,” he said.
“He is 195cm, so it’s good to see the forward line structure up with size.”
And of Crichton, Lloyd said: “Jesse has been training really hard and he deserves to stay on the list and continue his career at the club.”