Marc Worden, probably better known for playing adult Alexander Rozhenko on DS9.

Oh it’s the incredibly growing Alexander, who has a nebulous timeline of growth at best.

I mean, yes, we don’t know how long Klingons go from toddler to teen to this. It’s only been seven years since we’ve seen him on tng as a wee toddler.

Also imagine Worf with the same growth spurt playing with other 12 year olds, makes the headbutting to death story funnier