You can find many of these exercises in PDF format online by searching for "chicken pickin' exercises pdf" or "country guitar exercises pdf". Some popular resources include:
According to instructors like Jason Loughlin (Premier Guitar) , the essence of the "cluck" comes from a few specific physical movements: chicken pickin exercises pdf
If you want that snappy Telecaster tone, you need to isolate these movements. Here is a preview of what is inside the downloadable PDF. You can find many of these exercises in
e|---------5-7-5-7-5-7-5-7---------| B|-----7-5-7-5-7-5-7-5-7-----| G|---7-5-7-5-7-5-7-5-7-5---| D|-5-7-5-7-5-7-5-7-5-7-5-7-| A|---------------------------------| E|---------------------------------| chicken pickin exercises pdf
Play a note on the G string, then immediately snap the open B or E string with your middle finger.
This drill coordinates your pick and middle finger using a common country G major pentatonic framework.