Are bigfoot human? Right away the discussion devolves into a different question–what does it take to qualify as human? As much as I’d love to dodge that one, it’s necessary to address it.
Neanderthals are humans, but not our (sub?)species, for example. The characteristics of a group need not apply to all members of a group. For example, we know humans have five fingers on each hand, but being born with six fingers on each hand does not count you out. So to speak.
Let’s just use these criteria below as a starting point. A no for any criterion might disqualify bigfoot from human status. Do sasquatches qualify as humans according to the these?
Animals > mammals > primates of the great ape department probably
Intelligent, as animals go yes
Have opposable thumbs yes
Have a spoken language yes
Use individual names for ourselves unknown
Have spiritual beliefs unknown
Make and use tools and fire unknown
Know of and try to direct the future probably
Different bunches of sasquatches will fall into different classes, it seems likely.
Although this is far from decisive, scientific, or comprehensive, it can be a place to start. We at least know some kinds of things we want to find out about these creatures so we can determine how eventually to classify them.