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Hello vmcaldart!

1. I think your specimens are good fit for Uranotaenia sp. but nothing could be said more from these images. Although you may try to identify them to the species level with some keys which could be found on the internet (e.g. http://www.mosquitocatalog.org/files/pdfs/074300-11.pdf) the best thing is to ask your local expert.

2. Regarding other bloodsucking flies that feed on frogs, biting midges (Ceratopogonidae) of the genus Forcipomyia (Lasiohelea), mosquitoes of the subgenus Neoculex and occasionally of the other genera are mentioned in the literature as frog-biters.
Here's the reference on Forcipomyia: SPINELLI, G.R., SCHAEFER, E.F. & A.I. KEHR (2002): First record of biting midges (Diptera: Ceratopogonidae) attacking frogs in the Neotropical Region. - Proc. Entomol. Soc. Washington

3. Thank's for such an inspirational topic! Since the representatives of all the above-mentioned taxa (with the exception of Corethrellidae) are known from Europe but rather comprise a scientific curiosity for medical entomologists, I didn't find any studies dedicated to research the phonotaxis in local fauna. So, it would be interesting for me to do something on this issue... Could you please share some technical aspects of your traps?

To contact me, send an email to: filatovmidge@gmail.com