GREATDOGE ($GDOGE) is having a presale on October 19th at 16:00 UTC. This appears to be the official group, as it warns against scam groups. The project has a website at greatdoge.com and a contract address of 0xaAc80eb2Fb9F419e97b1fd94e0008189eBe52400. Similar projects include GangsDoge, AI-DOGE.ORG and GEGAGEDIGEDAGEDAGO which are meme coins or P2E projects.