The short answer is no, but you can buy the XL2 Triple Seat which is basically the same thing as the XL1 Tandem Seat, but it has a different connector that fits on the XL2 double stroller. The ZOE triple tandem seat also has larger wheels that are the same as the XL2.
so if you’re looking for a ZOE triple stroller, the only option is to buy the XL3 or to buy an XL2 and the triple tandem seat.
Also, many pellle ask if you can add on a third XL1 Tandem Seat to make an in-line triple stroller. The answer that question is no as well. You cannot add a third seat on. The angles would not accommodate this for the connectors.