I have to agree about not taking breeding age adults, they seldom adjust to captivity anyways. I have a female eastern I found on the road as a still bright green froglet. She still had a bit of a tail so I know she was very young, and showed no fear of humans. Being a high traffic night and drizzling, I wagered it a safe bet she would wind up roadkill. And I had a small set up from a male gray I had kept through it's natural life (r.i.p. Frodo), brought her home and she started eating later the first night. Now not so little Fiona is as tame and friendly as they come, she will pace on the front doors asking to come out, perch on my hand and snuggle right in, take a nap for as long as I allow her. (I wash my hands well in basic Dawn, rinsing with hot water, but still don't like to handle for too long as the oils and salt will replace itself on my skin) She will sit on a small glass hex bowl I have on my desk all day with me watching the computer screen, or just chilling while she watches me.
Grays have wonderful personalities, and can become very tame, but collect a few eggs in the spring, tadpoles or a young froglet, it will be worth the work of finding them. As they never know what they are missing, ignorance does seem to be bliss, they'll settle better to captive life if they don't know the difference.