1992-1999 Suburban was made on the GMT400 platform which started in 1988 for fullsize GM pickups. All Suburbans are 4-door (at least GMT400 and newer).
1992-1994 were years when Blazer (essentially shorter and 2-door version of the Suburban) was available.
They can also be called the K5 Blazer, just like previous generations.("K" denotes 4WD; "C" in C1500 truck denotes 2WD).
One should not confuse the K5 Blazer with the smaller S-10 Blazer which was made on midsize (compact?) truck platform and is of course not part of the GMT400 family.
In 1995 the Tahoe started, in 2-door and 4-door form. I guess the 2-door is the new name for the K5 Blazer. The 4-door can be viewed as either the longer version of the 2-door, or the short version of the Suburban.
They are all essentially the same, just with different wheelbase and overall length.
The 2-door was available with either 6.5 turbodiesel or 5.7-liter gasoline V8 called Vortec (essentially the 350 smallblock Chevy). I think the 4-door could only be had with the 5.7 Vortec. Suburban additionally had the option of 7.4-liter big block V8 (not sure about the diesel).
They were all based on light duty fullsize trucks (1500), Suburban was also available in beefier 2500 form.
GMC versions were called Yukon (Tahoe equivalents) or Suburban (same as Chevy Suburban).
In 1999, Cadillac Escalade was introduced (as competition to the succesful Lincoln Navigator), a luxury version of the GMT400 Tahoe (I don't know if Cadillac had the Suburban equivalent back then)
After 2000, GMT800 platform was introduced. 2-door versions were gone. GMC version of the Suburban was from then on called Yukon XL. Cadillac version of the Suburban is called Escalade ESV.
As to why the new Tahoes look so large to you - well, most vehicles have grown in size in the last 20 years. For example, modern midsize pickups are almost as big as fullsize pickups from the 80s or 90s...
Compare the dimensions of each generation of the Tahoe here:
https://en.wikipedia.org/wiki/Chevrolet_Tahoe