Attempting amplexus; a male exclusive characteristic?

[Gentlemangorath]

So after feeding my two AGTF's frogs the other night, Verde and Boom were right next to each other on the Fluker's Vine, when Boom, my unknown who I feel may be male, climbed on top of Verde (my frog I know for a fact is male) and I believe tried to attain amplexus. After Verde blew up a bit (didn't croak but expanded), Boom hopped off and that was that. So my question is, is amplexus occasionally attempted by females for whatever reason, or would that be a sign that my little guy is in fact a guy? I still have yet to hear a peep out of him I believe (I may have heard two frogs signing while I was sleeping, but I only heard clearly recognized one, so I may have imagined the second in my half-asleep state), but am still trying to figure out his/her gender, and have been looking for any indicative signs.

tl;dr?- Is amplexus male only, or do females occasionally try to get top position for whatever reason. :P

[Gentlemangorath]

Well Boom tried it again last night during feeding, so if someone does know anything about this, it would be very helpful for me determining if they're both male :P.