>>367408well if it looks like that im not sure how well the trap idea would work since they tend to stick to walls and everywhere
i still think a damp dark area may attract them though
have they been talking to you? the greys treefrog can be quite vocal and loud
https://www.youtube.com/watch?v=9bzotS1ow0Qluckily they arent too bright and you often can just grab them even if you walk right up in their line of sight
sorry im not much help i havnt ever heard of any frog traps nor does google lend many results to it
as for me im fine