Idioms:
https://www.youtube.com/watch?v=WVHlVbIgUH0
https://www.home-speech-home.com/idioms.html
Similes:
https://www.home-speech-home.com/simile-examples-for-kids.html
Metaphors:
https://www.home-speech-home.com/list-of-metaphors.html
Proverbs:
https://www.home-speech-home.com/proverbs.html