Claw Punch (3.5e Feat)
From D&D Wiki
 Claw Punch [Monstrous, Martial Style]
Fights like monk, claws like bear.
Benefit: Your slashing natural weapons count as unarmed strikes.
Special: No ability or feat that has already been applied to both (such as Weapon Focus) stacks with itself.
Note: Another, similar feat exists (Still Weapon Technique), which should not be confused with this one. Claw Punch is much more restrictive (read: more likely to get DM approval) and applies ONLY to slashing-type natural weapons.