The Championship club revealed in December that they had received two enquiries for the 24-year-old, whose contract runs out during the summer.
"Swansea enquired last night (Wednesday) about David Ngog's availability," Sporting Life quotes Freedman as saying.
"As we speak right now the two chairmen are talking to see what they can do or what they would like to do. David N'Gog is aware of it and he's also having a look at his position.
"There's six months to go left on his contract, I'm in a difficult position, it's very hard to stop a young player going to the Premier League and it's very hard to stop a player with six months left on his contract."
N'Gog joined Bolton from Liverpool in August 2011.