Actually my Rog3/Src1 have a toad as a familiar. But the choice isn't for to +2CON (or at least not only).
My ToràK is an Halfling, in a Elves-dominated-world. He is a noble halfling, good behaviour and so on, and he want to demostrate that even a minor race as Halfling is full of good people. Now, a raven, or a cat... well, there are elven-wizards choices. Toad is ok, 'cause even a minor familiar as a Toad can be a good familiar.
It is very funny to play. Wrak, my toad, is an interesting familiar. When a group is in a stale situation, a "wrak wrak" fill the room
Ok ok.. sorry for my english. I hope you understand what i mean..
My ToràK is an Halfling, in a Elves-dominated-world. He is a noble halfling, good behaviour and so on, and he want to demostrate that even a minor race as Halfling is full of good people. Now, a raven, or a cat... well, there are elven-wizards choices. Toad is ok, 'cause even a minor familiar as a Toad can be a good familiar.
It is very funny to play. Wrak, my toad, is an interesting familiar. When a group is in a stale situation, a "wrak wrak" fill the room

Ok ok.. sorry for my english. I hope you understand what i mean..