I don't know about a growth spurt, but I do know my little boy roborovski has gone a bit wild during his teenage months - he just won't stay still and zooms all over the place. And loves rubbing his scent gland on everything. He's a little weirdo, but I love him
. Am hoping he'll calm down a bit once he gets older.
Before that, he did get a little chubby at one point, but now eats a fair bit yet stays trim due to the aforementioned zooming around.