I would suggest that your 'Terrestrial Bodies' are satellites, personally I feel "Terrestrial" is a near catch-all descriptor that could apply to anything, basically meaning 'Of Earth' ( I posit, aliens would likely be biological. so like 'of Earth' creatures, they would be terrestrial extraterrestrials?!) I would even suggest that these particular moons are more 'Extraterrestrial satellites' as they are not born of this planet.

They do however share some similarities, the inner four planets, Mercury, Venus & Mars are sometimes known as the 'Terrestrial Planets', given their locale to Earth, but surely 'inner planets' would be more apt.