Reading the online description for fire giants, you read that
They are also fond of grabbing smaller opponents and tossing them somewhere very hot.
I always imagined larger creatures to do that. A giant grabbing and throwing a halfling in lava, an ogre throwing a gnome away annoyed by its pick etc etc. But is there actually a valid 3.5 mechanic to do that? The only thing that comes to mind is the dragon's snatch ability and nothing feat-like. Please enlighten, so my PCs can be used for baseball between a clan of fire giants!