Can you provide some more information in order to help narrow things down? Smaller frame is very subjective. If you're used to modern flippers most traditionals are going to seem smaller to you.
What closed length are you looking for? Giving a range would help.
What is your budget?
Does your work day involve business suits and board rooms, cutting cardboard, chopping down trees?
The two patterns that every upstanding Traditional regular is obligated to bring up are the peanut and the GEC #15. Both carry very easily and are wildly popular. Case and Queen are both making peanuts that are worth looking into.
Queen's S&M Gentlemen's series are all quite small.
http://queencutlery.com/SXM_Gentlemen_s_Stag.html The Queen small sleeveboard is one that I'm planning on giving a go.
GEC's smaller patterns are the #6, #9, #22, #25 and #33. They all carry very easily, though the 22 and 25 are pretty stout and fill the hand more than their measurements would suggest.
There are also patterns that are made by multiple companies that are known for being small. Anything that says pen knife or gentlemen's knife is usually going to be small. The previously mentioned peanut is a pattern that stays under 3" in just about all iterations. Tribial mentioned a whittler, and most whittlers feel pretty small in pocket to me. That's one you have to be careful with though, as there are beefy whittlers out there.
That's probably already an overload, so I'll stop there. Here's a quick picture of three "small" knives that I just happen to have on hand right now. From left to right they are a peanut, a Primble 5304 whittler, and a GEC #15. The 15 looks monstrous by comparison, so I put the Sharpie in there to give you a sense of perspective.