Are there any wands that look like a gun, sling or mini crossbow for transmog ?

[Invisibility]

Are there any wand and off-hand items that look like a gun, sling or mini crossbow for transmog ?

Also are there any two hand weapons and one hand weapons that look like guns , crossbows and bows ?

Also again are there any fist weapons that look like shields ?

[Venziir]

Nope, why would a wand look like a gun?

Only thing like what you describe would be the axe-muskets from Kul Tiras.