Tokina AT-X 11-20mm f/2.8 PRO DX lens profile is available in Lightroom version 6.1 and above as mentioned in this article : Work with lens profiles in Adobe Photoshop, Lightroom, and Camera Raw
Which version of Lightroom do you have?
I am using 5.7. Is there a way to import that profile to 5.7?
You need to upgrade to version 6 for this.