master bullfrog on the phone

Elijah copies two lines of text every day for his school work.  Whenever he finishes a poem, he gets to draw a picture of what the poem was about.  Today he copied the last two lines of the following:

Twenty froggies went to school,
Down beside the rushy pool.
Twenty little coats of green,
Twenty vests all white and clean.

"We must be on time," said they,

"First we study, then we play.
This is how we keep the rule,
When we froggies go to school."

Master bullfrog grave and stern,

Called his classes in their turn.
Taught them how to nobly strive,
Likewise how to leap and dive.

Taught them how to dodge a blow,

From the sticks that bad boys throw.
Twenty froggies grew up fast,
Bullfrogs they became at last.

Polished in a high degree,

As each froggy ought to be.
Now they sit on other logs,
Teaching other little frogs.

Daddy: "You can draw a picture of the froggies today."
Elijah: "Hm, twenty frogs is a lot to draw.  I'll draw the bullfrog, too!  He'll be on the phone."
Daddy: "Why does he need a phone?"
Elijah: "Because it says, 'Master bullfrog grave and stern, called his classes in their turn'."
Daddy: "I don't think that's what it means."
Elijah: "No, I think he called the froggies while they were at home."

Here's the final result: