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? 
Some coins are not just sellable. Transferring them sometimes is even a waste of resources, because the gas fee might be more than the price of the token to be transferred, so it is more or less like losing. There are even times that, such coins, no matter how little they may appear now, they might become big later in future. So just leave them there and make do with the ones you can easily sell.