They do have a complete metamorphis.The first are eggs(ovesly)Then they turn into a tadpole after that they start to grow legs which they call tadpole with legs.Then they grow into a frog body with...
Your question is not so clear as it is not given in context, but from what I can guess is- the frog changes its shape over the course of its life. It starts off as a tadpole (shape 1), slowly grows...