Hi, Claudia and welcome to the Forum. I have 7 Pacific Chorus frogs myself, and I love this species. 7/8th of an inch is still a bit small to definitely sex, but if you post a picture, we can always give it a try. Have you heard any pips or squeaks at all? I have one young one now trying out his vocals, and it's very cute to hear-he's about an inch long. What exactly are you studying in Alaska?