An introduction or practice PPT and two fun cartoon videos you can use to practise "What's this / that?" as a type of look and listen. I've also attached a hidden puzzle game, which isn't mine. Thanks to "wretchard".
The Pororo bomb game is a short game that I estimate will take 10-15 minutes.
The Spongebob bomb game is a longer version, which will take most of the lesson.
The Mario Pass the Ball game is a short game focusing on correct use of "a" and "an."
A video to practise "What's that?" "That is a / an ..." + animals.