蝌蚪观察日记可以用英语表示为 "tadpole observation diary" 或者 "tadpole journal."

蝌蚪是蛙类的幼体，通常指小蝌蚪。观察日记是指记录观察信息的日记。

下面是一些例句：

"I kept a tadpole observation diary during my biology class and recorded how the tadpoles developed into frogs."
"I found it really interesting to track the changes in the tadpoles in my tadpole journal."
"My pttle brother loves to watch the tadpoles in our backyard pond, so I made a tadpole observation diary for him to record his observations."

中文翻译：

"我在生物课上做了一个蝌蚪观察日记，记录了蝌蚪如何发育成青蛙。"
"我发现在我的蝌蚪日记里记录蝌蚪的变化非常有趣。"
"我的小弟弟喜欢在我们后院的池塘里看蝌蚪，所以我给他做了一个蝌蚪观察日记，让他记录他的观察。"