Hello ! I'll start with the basic info about my frog, and then move on to the questions. I've had him/her for about two days, and s/he has been behaving ( what i would assume to be ) normally, eating, climbing, sleeping, soaking, etc. When I brought him/her back from the pet store ( a local store ) s/he was quite brown
Name: tumblr_n8b8zhscL01qknsc9o1_500.jpg Views: 155 Size: 99.4 KB

but turned green after a few hours and has been so ever since.

Name: tumblr_n8bgbacEUK1qknsc9o1_500.jpg Views: 154 Size: 71.7 KB

The frog has eaten 4 crickets, one yesterday and three today. I've fed the crickets to him/her in a glass bowl so s/he doesn't swallow substrate (eco earth). The temperature has been consistent at 75 degrees Fahrenheit. The humidity tends to fluctuate, I try to keep it around 60%, but it tends to fall down towards 50% every few hours, so when i'm sleeping / leaving the house I spray until it's way up at 80% just so it doesn't drop down below 55% when I'm not around.

I've been trying hard to identify the frog's gender so I can settle on a name, but I'm getting a lot of conflicting signals, especially because I have no clue how old the frog is. the only things i know are:
1. s/he is 3 inches long.
2. the frog was croaking earlier. I only caught a glance before it stopped, but I didn't see the croak sac expanding like they do on mature males.
I really can't tell if s/he has nupital pads on the thumbs ( as described here ). I just can't get a good look!

So:
Any tips on keeping the humidity consistently high enough? It's summer here so the air is already naturally humid, I'm worried about the winter when it will be very dry and I won't always be around to mist the tank.

The frog hasn't pooped yet. When should I start to be worried about this?

Any help on identifying the gender?

Thanks!