I'm looking for the names of "Rollfondant" and "Modellierfondant" in english. I'm new to the métier but as far as I can tell, Rollfondant is used to cover a whole cake, while Modellierfondant is used for modelling small figures to put on the cake. Thanks!
The generic term for sugar-water pastes used to decorate food is icing or frosting.
Rollfondant sounds like ready-to-roll icing, but it could be royal icing, which contains egg white.
Modellierfondant sounds like modelling paste. There are various recipes which use different additives to the core ingredients of sugar and water in order to obtain a suitable consistency and to dry without cracking.
Wikipedia differentiates between "rolled fondant" and "sculpting fondant": http://en.wikipedia.org/wiki/Fondant_icing
"Rollfondant" is "Rolled Fondant" or simply "Fondant"
I can't say for certain, but I suspect that "Modellierfondant" is also called "Fondant", but a different consistency (and we don't differentiate in English) ... or it's what they call "gumpaste", which is typically used for making flowers and other more delicate items. There's also "modeling chocolate" (chocolate based), and of course Marzipan (which might be called "Almond Paste") for