100% humidity with a top that is closed to ventilation most of the time can cause stagnant air near the floor. It discourages growth of most plants. I usually do my tanks with high humidity and a couple muffin fans blowing in and out.
I'd hesitate to guess they are cross breeds. Not many people cross dart frogs. Their are lots of types of tinctorious and lots of variation within those types of tinctorious. My guess is if you google Dendrobates tinctorious and look at pictures you will find some that look a lot like what you have.