Granted, I'm one of the long-term SFC ISC around, but I'm not 100% familiar (due to not having all the books) with the SFB ISC.
Are you saying that Veltressai quad-links are called Meskeen in SFB? If so, where's the reference to that, cause I haven't seen it yet. My SFB collection consists of BS, AM, C 1-3, J, K, R 2-5, P6, along with Captain's logs 16,24,26 and the original Prime Directive rulebook.
Since I've never seen that (or missed it in every re-reading I've done on my ISC material), I always thought the SFC froggy-Meskeen were a complete invention of Taldren. If they are a new race just using an ADB-sanctioned name, then you could have some fun there...
Just like the SFC Mirak are, at heart, renamed Kzinti, you could come up with a new name for the ISC's recently discovered Froggy-race, and include them into GPD that way.
Sorry for adding to the confusion...