Is there any two handed concealable weapons? Or at least inconspicuous ones?

[Malik Gyan Daumantas]

I know the bladed scarf is the thing and it can be kept on your person and people would be none the wiser until you whip it out but are there any other kinds of weapons that fit that mold?

[Mysterious Stranger]

The garrote is two handed weapon that is easily hidden or disguised as something else.

Some polearms and spears could easily conceal the blade with a cap of some sort to hide the blade.

The Double walking stick katana fits what you are looking for.

The dwarven dorn-dergar is basically a ball on a chain.

Sanssetsukon can probably be hidden fairly well. Put it in a tube of some sort when not in use. A lot of the monk weapons don’t look like weapons or are easily hidden.

[Wonderstell]

The Switchscythe has rules for treating it as a hidden weapon and grants you a +5 on such checks.

If you simply want it to be inconspicuous, any weapon will be if you have the Power of Suggestion trait and can make a DC 20 bluff check. If a glaive can be confused for a quarterstaff, it can certainly be confused for a walking staff.

[*Khan*]

Glamered weapon enchantment.

[Hugo Rune]

As Mysterious Stranger says, an ornamental, probably rigid cap, to a pole arm to make it appear as an ornate walking staff. IRL many Japanese weapons were derived from peasant tools. A hand are and a hatchet are basically the same thing