オタマジャクシのその後 Tadpol became frog?

English follows

オタマジャクシを大量に見つけたあの水たまりに行ってみた。

なにやら鳴き声が聞こえた。もしやと思い、よーく目を凝らして見たら、カエルがいた！！

でも結構大きなカエルで、あの小さなオタマジャクシがこのカエルになったとは信じがたい。

I went to a pond where I saw many tadpoles.

I heard sound of something, and I looked for very well there, I found a frog!!

But it was quite big, I didn't believe that tadples that I saw became this frog!