Well, the draconic dieties do allow non-dragon worsippers, and I only saw Bahamut and Tiamat(they're under the Greyhawk Dieties; I'm not including them here).
Aasterninian - Chaos, Dragon, Luck, Travel, Trickery - CN
Astilabor - Dragon, Protection, Wealth - TN
Chronepsis - Death, Dragon, Knowledge - TN
Falazure - Death, Dragon, Evil - NE
Garyx - Chaos, Destruction, Dragon, Evil, Fire - CE
Hlal - Chaos, Dragon, Good, Trickery - CG
Io - Dragon, Knowledge, Magic, Strength, Travel, Wealth - TN
Lendys - Destruction, Dragon, Law, Protection - LN
Tamara - Dragon, Good, Healing, Strength, Sun - NG