Flaring nostrils

[Leefrogs]

I guess I wouldn't have thaught about it, but Lump doesn't do it. Other frog Kermit, breathes with her nostrils moving. And a couple times she's rubbed her face with her hands. Lump hides allot so I never had a chance to see until recently when he's accepted food from tweezers. Is this normal, a quirk, a sighn of respitory infection?
Paranoid mom