A frog in a dream often points to transformation happening in stages, much like its own journey from water to land. Frogs are also linked to cleansing, so the dream may reflect a desire to clear something out before moving into a new phase. Being in an in-between state, not quite one thing or the other, is usually exactly what the frog is naming.
Mercury conflicts with those who are ruled by Jupiter, and Jupiter conflicts with those ruled by Mercury. - Picatrix (Andalusia, ~1000.AD)