According to Wikipedia, the Tosfos to Moed Qatan were written by a student to a certain Rabbi Yitzhak. Do we know anything about who he was or where he lived?
Specifically, to whom is he referring in Moed Qatan 18b (s.v. אין כותבין) when he contrasts his views with those of "the [other] tosafists"? In other words, when he says "פירשו בתוספות" is he referring to an edited collection called Tosfos (like the one that we have - maybe even the very one that we have) or to the opinions of individual tosafists, which may or may not have been committed to writing?