A good pic of the eyes would help a lot, but it looks like it could be a very dark (low temp incubation) Tremper Albino. The term "chocolate albino" is simply a marketing ploy to sell dark albnos. It is not a 'true' morph.
id say a really dark tremper. Like Marcia said, the term 'chocolate' albino is just a name for darker albinos to get a few extra $$$ Not a real morph though.
Even male trempers kept at cool temps darken up.... and stay dark. I would say being a rescue, you have a tremper that was kept at room temps for a long time. I see no black which is an albino trait and that head pattern is rare on non albinos.