It's is April 15 2022 can I still file a 1099 nec for the 2020 yr

No.   2020 income has to be entered on a 2020 tax return.   You cannot use it on a 2021 tax return.   If you did not prepare or file a 2020 return you can still do so---by mail--- or you can amend your 2020 return to include that 2020 income.

Online preparation and e-filing for 2018 and 2019 and 2020 is permanently closed.

To file a return for a prior tax year

 If you need to prepare a return for 2018, 2019 or 2020 you can purchase and download desktop software to do it, then print, sign,  and mail the return(s)

https://turbotax.intuit.com/personal-taxes/past-years-products/

You may also want to explore purchasing the software from various retailers such as Amazon, Costco, Best Buy, Walmart, Sam’s, etc.

Remember to prepare your state return as well—if you live in a state that has a state income tax.

https://ttlc.intuit.com/community/state-taxes/help/how-do-i-contact-my-state-department-of-revenue/00/25573 

When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s.  Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS/state received the return.

Federal and state returns must be in separate envelopes and they are mailed to different addresses.  Read the mailing instructions that print with your tax return carefully so you mail them to the right addresses.

Note:  The desktop software you need to prepare the prior year return must be installed/downloaded to a full PC or Mac.  It cannot be used on a mobile device.

Select your tax year for amending instructions:

• 2020

No, you will have to claim the 1099-NEC from 2020 on your 2020 tax return it can not be filed on your 2021 tax return.  If you filed a 2020 tax return you will have to amend your 2020 tax return.  This TurboTax link https://How do I amend my 2020 return? has information to assist you in filing an amended 2020 tax return