Cope's Gray treefrog finger injury

[David339]

Unfortunately I did not notice my tree frog and he had one finger in the terrarium door. I shut the door on his finger accidentally and he jumped causing his finger tip to be severed. I did not see any blood or anything and treated him with neosporin. He is still getting around and seems mostly ok. Only the suction cup on one finger was damaged. Is there anything else I can do for him? Will his finger heal back as a nub or will he regenerate his suction cup? I feel horrible...