Actually there are fewer ogre females than troll females. Assuming 1 million total chars, 4585 would be female trolls and only 4256 would be female ogres.
Official Breakdown of Racial Percentages
Verant has posted a rather interesting look at the percentage of players playing each race, as well as the percentage of the sexes within each race. It's clearly lonely being a troll, especially a troll female. Check out the full breakdown at this link.