Dartmoor is a National Park in South West England that contains many granite outcrops of many different sizes.
The main authority (other than the OS map) is "Dartmoor Tors and Rocks" by Ken Ringwood.
The total number of named tors and hills on the moor varies considerably depending on the source.
Crossing[1] refers to tors as "These granite masses, of which there are about 170 on Dartmoor".
It is not uncommon for a tor and a hill to share a name, as Tor refers to the granite outcrop (for example Nattor Down), equally, as can be seen in the list above, many names recur.