What is the proper term for outward turned feet?

External rotation. Ext rotation deformity. Can be coming from the knees, hips, or the feet themselves. Can be from flat feet to external tibial torsion to femoral retroversion.
Out toed gait. The most obvious term is out toed gait. Otherwise the answer depends on what is causing the condition. The problem could be in the hips, knees, ankles or feet. Each problem would have a different name. For example, flat foot deformity can cause out toed gait.