Do other terrestrial planets have "earthquakes"?
For terminology, "Earth"quakes might be replaced with "seismic activity" since earthquakes are by definition restricted to the Earth.  

Technically speaking the other terrestrial planets in our solar system are not active in terms of plate tectonics.  Mercury undergoes rapid heating/cooling depending on its rotation and exposure to the Sun which must lead to some type of seismic activity, though likely very small magnitude.  I don't know of any seismic anomalies recorded on Venus or Mars but certainly there must be some type of activity from time to time due to changes in magma.  Magma - related quakes, though, are typically not as strong as quakes from the dynamics of plate tectonics.  For instance, Hawaii has seismic activity due to the volcanos, which produce maximum seismic activity that is orders of magnitude less than what two plates (e.g. a fault line) rubbing against eachother produce.  Though, the magmatic processes lead to a higher quake frequency.

I would wager that the moon of Jupiter, Io, and Earth have the strongest seismic activity in our solar system.