northwest passage
No, you can be one in explorers of the time, though.
Frogs were probably brought to america accidently on Christopher Columbus's ships or another famous explorers ships. No one has proof though for sure.
It does nothing. Pressing CTRL and the + sign zooms in your screen though
No
No, I don't think you can. Though that would be awesome.
they mostly though of spices and riches
Yes, though there's no "shortcut"; they'd still have to go to medical school.
I have searched and found no code for it, sorry. I will search more though.
Whiscash Pond is not in Pokemon Mystery Dungeon: Explorers of Time/Darkness. It is in Explorers: Red/Blue Rescue Team though.
Though many have Google searched it, the answer is yet to be revealed; there are pictures of them together but it does not reveal the name.
Yes, because even though the Viking were the first to explore the Americas, Columbus inspired other explorers to go explore it. No, because he thought he discovered the west India, not the America's.
Eevee is part of the starter pokémon in Explorers of Sky. Female only. Forgot what nature, though. So since it's a starter, it's in no dungeon.