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Is there an easy way to to make terminators look like ogryns?

Trade with someone who has ogryns?

Not at all.
The size difference is huge.
You'd literally have to sculpt a whole Ogryn model and chop up the terminator into sections to use as armour plating.

the arm of an Ogryn is thicker than the Terminator's legs and probably most of the torso too.

If you want a cheap alternative to Ogryns, look to Ogre Bulls from the AoS range (or Ogors, as I think they're called now). Grab some spare heavy bolters (if you have any heavy weapons teams, devastators, razorbacks or predators, you'll have an excess of these) and glue them in place of the sword.

Mechaemperor has it right. I have converted a few ogrynns from the fantasy realm, and usually you can get a body and head combo cheap on Ebay. Converting from termies I just cant see, unless what you want is a super heavily armored sort of ogrynn.
Just for grins and ideas, here's a link to my conversions and sculpts as Ogrynns (aI also say because of their size, Ogrynn's are easy to work on with GS) Going to link to my gallery so I dont clutter this thread with pic:

These are from my regular site, and a bit old:

http://edwardmystcreations.weebly.com/imperial-guard-ogryns.html