Why is this a Ice Giant?Your planet has moderate mass (17.0x Earth) with significant water, carbon, and nitrogen content, characteristic of ice giants.
Ice giants like Uranus and Neptune have icy interiors with thick atmospheres of hydrogen and helium, but not enough to be classified as gas giants.
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Tidal braking locked the planet to its moon: one face forever moonward.
A thin tidal-warmed subsurface ocean may exist, but conditions are marginal (10/100).
+5 temperature: large moon stabilizes the axial tilt - steady seasons+10 geology: tidal flexing sustains geologic activity+5 magneticField: a large close moon may help stir the core dynamo (speculative)