The Umi-Clones are the evil clones of Team Umizoomi. (They'll appear in an upcoming special)
Overtime, the Troublemakers zapiy been making al machine to make evil clones of Team Umizoomi. They mange to collect DNA and used it to make the clones. However, the machine had a flaw and couldn't copy the clones to look exactly like the team. Luckily, this makes it to tell the Umi-Clones and Team Umizoomi apart.