If you're a bad mom, then I was, too. I hated, hated, hated science fair project time.
Hmmm...could she separate the tadpoles and put them in different temperatures somehow, then find out at which temperature they turn into frogs first?
Edit: Out of curiousity, I just googled "Science fair projects about tadpoles" and found a ton of stuff, including something about determining how temperatures affect them. Great minds, huh?
Also, I found this question: "My son is in 4th grade and wants to do a project on the life span of frogs. From tadpoles to frog. But we can not think of a hypothisis that would tie into this." Someone answered it with several links.
What did we ever do without google? Wait, I know, we HATED, HATED, HATED science fair projects. :evil:
Sorry, I'm calmer now.