Uhm... if by "giant toad" you are refering to the The Almighty Frog of Tyria (or just "The Frog"), he resides in Lion's Arch in Kryta.
gwonline.net The Almighty Frog of Tyria resides in Lion's Arch at the top of the stairs between the fountain and the Crafter's Corner. Nestled under the shrubbery by the signpost for the Crafter's Corner, he will occasionally speak to the peoples of Tyria. He has a brother that resides under a tree near the Xunlai Agents in Lion's Arch, however his brother is a rather shy and quiet fellow. The Frog chooses to speak to the peoples of Tyria on rare occasions and in random districts of Lion's Arch. Please note that the Frog has indicated on August 21st, that he would much prefer to meet in International Districts. When he speaks, he shares with us foretellings of the future for the world of Tyria in his cryptic, riddling ways. Below, you will find a listing of his speeches and words of wisdom.
And he ain't that big...
What's the point in that link??
I asked that myself too... *removes link*
but you didn't remove it from the quote...
Then you might as well delete my whole post. (I can't anymore.)