What about the Spemin

Hint 1 of 4:

Appearance : potatoes with "Jetson" style lightning rods.

Hint 2 of 4:

Ship style : fuzzy balls connected by rods like tinker-toys.

Hint 3 of 4:

Home world : 82-148

Hint 4 of 4:

Use posture: act hostile, then friendly if you like.