Re: Sexing my R. Imitators
In your second picture, the frog spread eagle on the glass, appears to be a female.
In your third picture, the frog on top appears to be a female.
I cannot see any other frog clearly enough.
Your best shot for sexing thumbs is an overhead shot, from the top down.
You can often promote calling by misting heavier for a week or so. Every now and then, play a recording of imitators calling. Try playing it at different volumns. Try very softly at first, and increase sound a bit if 10 minutes of calling, while you are dead quiet and out of view, doesn't bring results.
Sometimes it takes a while. Sometimes you sex your frogs within minutes of playing calls.
Questions are not ignorance. Questions are the birth of knowledge.