What do you call a Biped that has Quadruped qualities

[ShadeZ]

Something that is bipedal but moves kind of like how people free run and in fights crouches or drops to al fours?

 

[Orc Knight]

Facultative bipedalism - Wikipedia

Possibly this, but there may not actually be a word for it.

 

[S J Lee]

I'd go with "ape-like" or "gorilla-like" gait... but might emphasize the hands on the floor at some point...

I presume you mean

or

BUT
you get POV problems if we see what the character sees, but your character would not know what an ape IS....

 

[Chuck]

My first thought was also how gorillas walk. The term I usually see used to describe this is "knuckle-walking".

 

[S J Lee]

there IS the phrase "knuckle-dragging"
Etymology. From the habit of some primates of walking with the forelimbs dragging along the ground.

knuckle-dragging - Wiktionary
en.wiktionary.org › wiki › knuckle-dragging
but is also means...
knuckle-dragging. (pejorative) Holding beliefs, or having attitudes thought to be primitive or uncivilised; hence apelike.

 

[ShadeZ]

Thing is it's like a reverse gorilla. It runs biped, climbs with all fours and fights often from the ground. It's moves are usually described as feline as it is a feline hybrid.