You can see all listed coin/tokens on UNISWAP on here.
https://coinmarketcap.com/exchanges/uniswap/from CMC, we can see there are ~40 coin/tokens listed on there (5 of them don't have any volume anyway). I don't think it's scam or not, but rather about pump and dump coin/token on UNISWAP
that officially listing , beside of this list there are many token traded in uniswap that not recorded in coinmarketcap or coingecko. i am joined in telegram group that give an update about listing in uniswap, and almost every second there are new token added. as decentralized exchanges every one could add their token by adding smart contract, so easy for us. and because of this we will see many scam token there.