"I raised frogs every spring in our house from tadpoles and by end of summer our house was overrun with frogs"

In this quote, William Joyce explains his experience of raising frogs in his house every spring. He starts with the process of raising them from tadpoles, which are the early stage of a frog's life. As the summer season advances, the frogs grow and increase, leading to an abundance of them in his home. Making use of the word "overrun" suggests that there were a large number of frogs, possibly more than he had actually anticipated. This quote highlights the pleasure and enjoyment of witnessing the growth and advancement of these creatures, however also the potential mayhem and mess that can come with it.