Does every dslr camera making company produce their own lenses?

Are there any companies that use any other kind like canon or nikon lenses?
i know there's third party lenses for canon and nikon bodies…
but are there any third party cameras that use canon/nikon lenses?

Only via adapters, many of which are only partially funtional, since the digital camera revolution massively complicated things.

Sometimes manufacturers farm out contracts to specialist lens makers which add the correct mount and badge them according to the brand commissioning them.

The Nikon mount is the Nikon mount. The Canon the Canon, The Pentax the Pentax. The Sony the Sony. None of those makes lenses for the competitor's bodies.
Among the mirrorless cameras we see an exception of the Panasonic and Olympus brands using the Micro Four Thirds system with cross brand compatibility.
Sony is not in the lens making business and has Sony brand lenses made by Zeiss.
Panasonic has its lenses made by Leitz.

Pentax (the oldest SLR manufacturer in Japan) have used substantially the same lens mount since 1975 - 1975 lenses allow Av and M metering on All Pentax DSLRs (sorry Nikon, the D3xxx and D5xxx series can't meter with MF lenses). M42 screw (pre-1975) lenses can be used on Pentax DSLRs with a glassless adapter, and also allow Av and M metering.

Minolta (now Sony) changed their lens mount completely when AF came in - Canon did the same thing, but later.

Sigma also make DSLRs, and use a proprietary mount.

In the days of manual focus film SLRs, numerous small manufacturers used the Pentax mount (as Pentax started out using Praktica's M42 screw mount - also used by numerous manufacturers), but only the Kiev 17/19/20 series of FSU SLRs used the Nikon mount, and no third party manufacturer used the Canon one. Several companies in China made licensed copies of obsolete Pentax and Minolta models during the 1980s/90s.

Yes.

For a time, Fujifilm, when they were making dSLRs, made them with the Nikon mount. At that time, they didn't make their own yet (I think, not so sure). They've stopped doing so and concentrated in mirrorless already with their very own lens lineup and their very own X-mount system.

With micro four-thirds (MFT), You can buy a Panasonic Lumix camera and use an Olympus lens and vice versa as long as you stick to MFT.

In video, BlackMagic is (presently) known to use the Canon EOS-EF mount on some of their camcorders. They also use the MFT mount on some others.

IF you go to full-frame photography, you may encounter some lens boards made to adapt to Canon or Nikon lenses.

There's no such thing as a third-party camera company. The camera company is "first-party" always.