Hello Puzhvakkath Vaidyanathan, Shankaranarayanan (ext)
Yes, language packs are available for Windows 10 IoT Enterprise LTSC 21H2 ARM64, but they are distributed through official Microsoft channels such as Volume Licensing Service Center (VLSC) or Visual Studio Subscriptions (MSDN). They are not publicly downloadable via a direct link for IoT LTSC editions.
Harry.