I know all frogs are different and what not, but all 3 of my pacmans, all different species, all ended up being male and started calling within 3 months, and were small froglets when I got them. They all have a dark "beard" on their throats, the ornate's being the most pronounced. We have been having a nice high pressure system for the past week so there isn't much calling right now, but at least one of them has something to say every night. All that being said, I would venture to guess your chubbs is a lady