Answer:
sternohyals and petrohyals muscles
Step-by-step explanation:
The breathing in frogs is Bucco-pharyngeal respiration, known as mouth respiration.
Sternohyoid muscle is attached to the lower side of the hyoid bone, and petrohyoid muscle is attached to the upper part of the hyoid bone. By oscillaton or lowering and raising these muscles the buccopharyngeal cavity is moving and frogs breath.