There is no plural of Lego since it is an adjective (derived from the phrase "leg godt"). If you're taking the liberty of calling a Lego brand building block a "Lego", then it hardly seems reasonable to object to others calling more than one "Legos".

"Please always refer to our bricks as 'LEGO Bricks or Toys' and not 'LEGOS.'"

From the horses mouth.

My original comment was perhaps ambiguous. You don't say "a Lego". Just like you don't say "a snow".

"Some Lego" "A Lego set" "A Lego brick"

Say after me...

But you can't say some Lego according to what you just quoted.

The point of that quote is to (show an attempt to) protect trademark. Like how Google asks people not to use Google as a verb, Lego is asking people not to use Lego as a noun. It's not establishing pluralization rules.

Anyway, I say legos and always have.

Well, when you're walking barefoot across the living room floor in the dark, and your kids did not pick up their toys, it's, "Ow! Damn! There are fucking Legos everywhere!"

"There are fucking Lego bricks everywhere"

Sounds like you had a hell of a lot of Lego as a kid ;-) (It was kind of hard to omit the s).