It sounds like one of those experiments that get done "because we could," but for what it's worth:
PARIS (AFP) - Frogs that started life as male tadpoles were changed in an experiment into females by estrogen-like pollutants similar to those found in the environment, according to a new study.Seems entirely unfair to the frogs involved. I wonder if the researchers offered counseling to the frogs they transgendered.
Anyway, I thought it was funny that they'd spend money on an experiment like this. You can do the same thing with the lawn mower. [by accident! please don't write PETA; I was talking only about accidental frog disgendering. (or is it "frog ungenitalization"?) I would never use a lawn mower to do that on purpose; and neither should you]