The correct spelling is "Foggintor" Authors have changed it to suit, as some of Dartmoor's tors are two-worded, whereas some are not. There's no real way of differentiating between the names. First edition maps have got it as "Foggintor" where other maps have it as "Foggin Tor"; but, I can tell you that it's "Foggintor"
Regards Tin Miner