Not knowing exactly where you are, what toads are in your area etc... all I can say is that for the majority of toad species in the U.S. it's still a bit early for tadpoles... you are likely to be seeing eggs for most of the species now through May... again very dependent on where you are, some toads breed all year long, others all through spring and into the fall... think a couple of species even start in February if I remember correctly.

Not much of an answer but as I said... all depends on where you are .

Gerry