knobby

adjective2

1. •
   Resembling a knob.

   • The baby kicked energetically. She caressed a knobby knee or elbow. — 2012
2. •
   Having many knobs or knob-like projections.

   • Further evidence for the correlation of basin structures arises from the spatial relation in both basins of the massifs to the associated knobby terrain. — 1975