Kyle Kuzma: Hey, Lonzo Ball ... I'm Selling Shirts, Too!

Lonzo Ball ain't the only Lakers rookie looking to make a dent in the sports apparel game ... his teammate, Kyle Kuzma, is also hawking his own line of shirts -- and they're selling like crazy.

Kuzma teed up some "Kuzmania" shirts on his website over the weekend -- and sold all 1,000 of 'em super quick. Now, he says he's got another batch on the way.

And get this ... they actually have a reasonable price tag at $27 a pop ... roughly half the price of a Big Baller Brand shirt.

And with Kuzma coming off a 38-point performance against the Rockets, his stock is rising in a big way.

Think LaVar's jealous??

Of course, Kuz and Lonzo are pretty tight -- Kuz even roasted Zo for his "$600" BBB hat -- but you gotta wonder if this is a little bit of a swag rivalry.