We watch Daniel Tiger's Neighborhood on Netflix but you could also try the PBS website: http://pbskids.org/daniel/
I especially like the song from the show: "When you're feeling mad/and you want to roar/just take a deep breath/and count to four."
2. Look at books.
- When Sophie Gets Angry--Molly Bang
- Sometimes I'm a Bombaloo--Rachel Vail
- When Miles Got Mad--Samantha Kurtzman-Counter
- Mouse was Mad--Urban
- Hands are Not for Hitting--Agassi