Ogres sometimes interbreed with other giants. The result of such crossbreeding is a giantkin ogre, which gains some abilities from its non-ogre parents. In areas where ogre clans live near large populations of giants, interbreeding can be so common that entire ogre clans consist solely of giantkin.
Pathfinder Roleplaying Game Monster Codex © 2014, Paizo Inc.; Authors: Dennis Baker, Jesse Benner, Logan Bonner, Jason Bulmahn, Ross Byers, John Compton, Robert N. Emerson, Jonathan H. Keith, Dale C. McCoy, Jr., Mark Moreland, Tom Phillips, Stephen Radney-MacFarland, Sean K Reynolds, Thomas M. Reid, Patrick Renie, Mark Seifter, Tork Shaw, Neil Spicer, Owen K.C. Stephens, and Russ Taylor.