Are there any planetary bodies in our solar system with significant amounts of nitrogen?

Question

Besides the earth.
All the talk about terra-forming Mars, though not completely meritless, seems to focus on getting oxygen onto Mars.

Mars has oxygen it's just bound to carbon. Plants could fix that.

Martian air needs to be like 80% nitrogen to be breathable and non volitile.

Answer 1

Pluto (only a demi-planet now) is almost entirely frozen nitrogen

Answer 2

Nowhere near 80%, with the exception of Pluto. And personally, I think it might be just a tad chilly way out there. I won't be in a hurry to move there LOL. The atmosphere of both Mars and Venus is about 3% or so nitrogen.