 Yvgeny Bulgolyubov (voiced by Fred Tatasciore), who goes by the name Buff Frog, is a frog who speaks in a Russian accent.He first appeared as Ludo's spy and right hand before he was replaced by Toffee and allied with Star in "Storm the Castle".Buff Frog later settles down in Mewni during Season 2 while starting a family with his children and befriending Star and Marco who help him babysit.