Banana feet" is a slang term for what kind of congenital deformity of the feet?

Pes Planus: Extreme pes planus, flat feet, may produce "rocker bottom" or "banana" feet.

Metatarsus adductus: Metatarsus adductus or metatarsus varus, like pigeon toeing- where feet are curled underneath and tucked in by the pressure of the womb during development. This often is a self correcting issue but may not be in some children. Consider seeing pediatric physiatrist for accurate diagnosis and treatments.Hips should be assessed as well in children with these issues.

PIGEON TOE/INTOEING: It is called pigeon toes or intoeing medical terms metatarsal varus or adductus it is condition in which toes point inwards when walking.