Yes, i believe the 9 jump rule is in both Froglet & Anti-Froglet.
I'm just guessing, but I believe the limit is in place because of programming issues. For example, I know in the past I had an issue with Halma also when trying to make a 10 jump move (only let me make 9). We got that worked out, but I'm guessing the 9 jump rule was put into place because of the same issue.
(kaŝi) Se vi volas ludi kontraŭ ludanto de simila nivelo, vi povas difini intervalon de BKR ĉe invito al nova ludo. Tiukaze neniu kun BKR ekster tiu intervalo povos vidi/akcepti ĝin, (Katechka) (Montri ĉiujn konsilojn)