These end in -aie / -oue / -eue too, but they are masculine.
Il était dans la boue jusqu'aux genoux.
He was knee deep in mud.
Tom a sauté par-dessus la flaque de boue.
Tom jumped across the mud puddle.
Son vélo était couvert d'éclaboussures de boue.
His bike was covered in mud splatters.
FrenchTextbook teaches rules like this, in a full beginner course.
162 lessons, 4,000+ exercises, and 6+ hours of audio.