Questions about Magic Resist, and Froglok Wizards of Sebilis

[Ashimar]

im wondering if there are "Magic Resist" potions that exist in norrath?. I know the guy in Freeport who sells potions but i didnt see any magic resist ones.

The Froglok Wizards in Sebilis. they nuke for 1.1k quite a bit and it only takes 2 of those and im dead.

As a warrior with a Sarnak Warhammer, does the STUN proc have a chance
of interrupting their nuke? i use a silken whip offhand, but when im going against
a wizard i was thinking of opting for a Sarnak warhammer / Yak club combo to
try and interrupt their casting more often.

Or maybe use a shield and try to bash-interrupt the frog? What more
can i do to prevent these mofos from nuking me? i just
hate getting nuked by these guys. they really suck.