Well, it's not custom, so it's copyrighted by the company that made it. So no, you can't use it in your indie game, sorry 
All sprites on the site are licensed/copyrighted/trademarked/whatever, so you can't use them for anything commercial. Even non-commercial projects might get complaints. To my knowledge, the only ones you'll be able to use are custom-made ones, and even for those you'll probably have to ask permission from the creators.
In any case, welcome to tSR
All sprites on the site are licensed/copyrighted/trademarked/whatever, so you can't use them for anything commercial. Even non-commercial projects might get complaints. To my knowledge, the only ones you'll be able to use are custom-made ones, and even for those you'll probably have to ask permission from the creators.
In any case, welcome to tSR