The way to prevent this may be more of a pain in the butt than just causing all the frogs to, er, croak. Go into peace mode each time before you move.
This is one of the weaker design decisions IMO.
If you're in peace mode and clicking neutral NPC's doesn't allow you to attack, then that's a fine design. Granted I wouldn't want to switch out to peace all the time. But if it keeps me from declaring war on every creature... <img src="/ubbthreads/images/graemlins/think.gif" alt="" />
