Note: Our suggestion is for your reference only, not legally obligated.
For your question, we would like to have below suggestion:
Pursuant to List of prohibited import/export goods promulgated with the Decree no.12/2006/ND-CP dated 23/01/2006 of the Government detailing implementation of Trade Law regulations on international buying and selling of commodities and agent activities including purchasing, selling, sourcing, outsourcing, border-gate transfer, and transiting of commodities with foreign countries, frozen chicken feet or breasts are lot listed in the above mentioned List. Therefore, it’s possible to send them to Vietnam.
However, they are kinds of foods, so you have to meet requirments on food safety and hygiene.