Terra Nova inhabitants

Attacker

This Novan watched the away team of Enterprise NX-01 and seen by Malcolm Reed who followed him. He ran into a cave and later attacked Travis Mayweather in front of the cave. T'Pol shot him. (ENT: "Terra Nova")

This Novan was played by regular stunt performer Steve Blalock, who received no credit for this appearance.

Guards

These two Novans served as guards for Captain Jonathan Archer and Doctor Phlox and brough them to their underground caverns. (ENT: "Terra Nova")

Both Novans were played by background performers who received no credit for their appearance.

Kids

These three Novan kids – one male teenager, a girl, and a boy – were sitting in an underground corridor. Each of them blew into a small object, using it as a wind instrument. (ENT: "Terra Nova")

In the script for "Terra Nova", only the male teenager and one of the younger Novans were described as using musical instruments, though all three youths do so in the episode. The same script also referred to the small objects they used for the instruments as "porous rocks." All three kids were played by background performers who received no credit for their appearance.

Older man

This older Novan was seen sitting in an underground corridor. He used a small object as a wind instrument, blowing into it. (ENT: "Terra Nova")

In the script of "Terra Nova", this Novan male is referred to as being "in his 50's" (the script also identifying the object he uses as a musical instrument as the skull of a Digger).
This Novan was played by background actor Clay Drayton, who received no credit for this part.

Woman

This Novan woman was part of the descendants of the Terra Nova colony that was destroyed by a meteor strike. While Malcolm Reed was held prisoner on the planet, she joined some fellow Novans in a concert in the underground caverns, using an animal skull as a musical instrument. Along with the rest of the colonists, she was relocated to a safer environment by Enterprise NX-01. (ENT: "Terra Nova")

In the script of "Terra Nova", this female is described as being "in her 20's" (the script also stating that the skull she uses as a musical instrument was that of a Digger).
This woman was played by background actress Tracy Foley, who received no on-screen credit for her appearance.

Her costume was sold in week 13 of the It's A Wrap! sale and auction. [1] [2]