Can female fertility drugs work as performance enhancers?

Possibly. The medication Clomid (clomiphene) and HCG and at times gonadotropins have been used by male bodybuilders to improve their muscle development by increasing testosterone.
Clarify please? No fertility drug is intended to be (or should be) used for any other purpose. What kind of performance are you asking about? Exercise, weight loss, or...?
Yes. In men, female drugs such as clomiphine, hcg, Arimidex (anastrozole) and tamoxifen have been shown to improve testosterone levels and athletic performance. This is considered off-label use, not approved by the fda.