Can a MagSafe Charger be used for an Apple Watch ?

You need to use an Apple Watch charging puck. Either the one that came with the Apple Watch, one of the Apple accessory Apple Watch chargers, or a 3rd party Apple Watch charger.

A MagSafe charger does not work (and I did just put my Apple Watch on my MagSafe charger and nothing happened, so I've even verified this for you).

A Qi charger does not work (I think a MagSafe charger is just a Qi charger with a magnetic ring around it)

when one goes to the magsafe chargers page MagSafe Charger - Apple

apple watch is not listed when one click compatability so this would make me

suspect that it would not work