I've never heard of ADF escapees, but I have heard of ACF houdinis. African Clawed Frogs grow to be the size of your hands and are renowned escape artists.
Also, don't be fooled by "Albino African Dwarf Frogs". These are mislabeled and are actually "Albino African Clawed Frogs".
I have to somewhat agree here, if you keep your water level like an inch bloew the rim, you'll have no problems.. my ACF's will bang off the lid when they jum, ADF's barely break the surface.