I have tried double front squat with kettlebells, and that did not create that much hypertrophy in the legs.
Leg Hypertrophy
1) Genetics
Some individual have genetic limitation for training certain body parts, like Legs.
With that said, some growth can be stimulated with training and diet.
I fall into this category.
2) More About Programming
What is most important is the Hypertrophy Training Program...
muscle growth is more about programming than specific movement.
It's all in the programming
Traditional Bodybuilding Hypertrophy Programs
"The Pump"/"The Burn" is the primary focus for a well written Hypertrophy Program.
As Arnold said, "You can grow with out the Burn".
Sets of 8 plus Repetition, with Load of 60-80% of 1 Repetition Max and Short Rest Periods Between Set (60 seconds) is of the keys.
Arterial Blood Flow
Blood is pumped from the heart to the working muscle in the exercise; Arterial Blood Flow.
Venous Blood Flow
Blood Flow from the working muscle back to the heart is restricted.
That because the Muscle Contraction limits Blood Flow Back to the heart.
Trapped Blood
1) It Pumps the muscle up, like blowing up a balloon.
2) It floods the muscle with Lactate. Lactate trigger the downstream Anabolic Effect.
Short Rest Periods Between Sets
The Short Rest Periods between Sets minimize blood flow from the muscle in the Exercise; blood remains trapped.
This compound The Muscle Pump with each following Set trapping more blood expanding slight increasing it.
No Pausing Between Repetition
Maintaining Constant Tension, not locking out at the top, ensure more blood remains trapped in the muscles.
Essentially, this method elicts that same effect as...
Acronyms
Many individual are don't what acronym mean or stand for.
My suggestition it to list the acronym, then spell it out and define what it is.
With that said,
BFR is Blood Flow Restrtion or KAATSU Training.
A tourniquet is applied that allows Blood Flow to trickle back to the Heart, Venous Blood Flow.
The tightnest of the Tourniquet need to be between a 6 - 7 on a Scale of 10.
More information can be obtained via google.
Calorie Intake
As John K basically stated, an increase in calorie intake is essential.