Sigma fp has a Leica L lens mount and currently there are 66 native lenses available for this mount.
The latest released lenses that are compatible with the fp are the Sigma 14mm F1.4 DG DN, the Sigma 17mm F4 DG DN C and the Sigma 50mm F2 DG DN C.
Sigma fp doesn't have a sensor based image stabilization system but
10 of these lenses already comes with optical image stabilization.
Since Sigma fp has a Full frame sensor, it has a focal length multiplier of 1x so you have to multiply lenses original focal length with this multiplier to find the Full Frame equivalent focal length of the lens when mounted on fp.
You may also also be interested in these:
Sigma fp Lenses with Image Stabilization
Sigma fp Lenses with Weather Sealings