Can I share website link like free domain cf, ml, ga, tk etc with my client in fiverr for my work sample.
No. Read the ToS.
Why would Fiverr let you do something that could let you take business away from them?
The forum isn’t for asking questions whose answers you can find with basic research.
Thank you @humanissocial for pointing it out!
Here is a list of approved portfolio links: https://sellers.fiverr.com/en/article/seller-faqs
Scroll to the bottom.
You can only share the website link of your portpolio.