No, but it will be available in the next Rhino WIP release.
Flow and Bend have been in RhinoCommon for a while.
Rhino.Geometry.Morphs.FlowSpaceMorph
Rhino.Geometry.Morphs.BendSpaceMorph
The functionality behind our SoftEditCrv and SoftEditSrf commands is not exposed in Rhino (yet).