The Toad is only for roleplaying & spellcasters who expect to see a lot of melee, like my Mage-brute builds. For everything else, they suck.
I agree that the rat is better in general.I figure Improved Toughness is better for HP. Or Toughness if you play at level 1-2.
As a familiar, the rat is better than the toad, even if we take out their special abilities.
In dragon 291, page 34 there is a gnome varient arcane gnome
in additon to all gnome traits
+2 int, -2 wis
UMD is always a class skill
They can no longer speak with animals
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Seems a pretty good wizard to me.