I have fairly little background on this, and hopefully I'm way off (because being right would make me sad).
Here's the checklist of similarity:
(1) There are concrete things: check. (duh)
(2) There are also abstract things: check.
(3) These abstract things exist in a publicly accessible domain: check.
(4) These abstract things are not mind-dependent: check? P:check. M:tentative check?
(5) These abstract things are the objects of thought: check.
(6) When we speak we express a token of the type: check.
(7) Do we token when we think, or do we interact with the type directly? I don't know what either says about this.
Chris, or anyone for that matter, please tell us we haven't regressed a few thousand years. What's the difference?
Also, I'm guessing Fregianism denies (4), and maybe (3). Correct?