with their mouth
The body parts you described are on a horse.
yes
skin
Some of the body parts that are visible on the dorsal surface of a frog include the head, trunk and limbs. Other parts are the external nares, the tympanic membrane and the anus.
legs and feet
Dorsal means on or near the back of the body.
Respiratory System
by the digestive system
It includes the pectoral girdle , the pelvic girdle , forelimbs, and the hind limbs.
Frogs have four limbs, two hind legs and two forelegs.
There are probably others, but the two most notable are gills and a tail.
platelets