I have done some bounty campaigns that were unsuccessful.. Also some were scams. But I have received some tokens from few of that projects. So I need to know this, Is there any opportunity that can I use this tokens? 
Make it a souvenir in your wallet at-least you will remember that you exert time for those token. It's normal in crypto that some of those projects will not give you a value and we have nothing to do with it. Just forget and move on.