You can practice the double consonant ck
Nursery Rhymes - Hickory Dickory Dock, Mulberry Bush & Humpty Dumpty (extracts)
from Emily&Anne on Vimeo.
These are the consonants of the clock ticking.
In Onomatopoeia you can see these sounds.
Onomatopoeia from Stuart Taylor 3D on Vimeo.
To animators of these great resources: Thanks for sharing.