Yes you can buy an Arkansas Fishing license online.
To buy an Arkansas Fishing License online check out this website at the link below.
https://www.agfc.com/en/resources/licensing/fishinglicenses/
That website will lead you to links where you can buy the Arkansas Fishing License online.
You can also buy Arkansas Fishing licenses at most fishing shops in Arkansas.
Another option to buy an Arkansas fishing license is to go to your local Walmart or any Walmart in Arkansas or any state and go to the Sports & Outdoors section and tell a worker there that you want to buy an Arkansas Fishing license.
I bought my Arkansas fishing license at Walmart.