Can someone explain to me what this poem is about?

I HAVE A LITTLE FROG

I HAVE A LITTLE FROG
HIS NAME IS TINY TIM,
I PUT HIM IN THE BATHTUB,
TO SEE IF HE COULD SWIM,
HE DRANK UP ALL THE WATER,
AND GOBBLED UP THE SOAP!
AND WHEN HE TRIED TO TALK
HE HAD A BUBBLE IN HIS THROAT!