Now on the one hand, I saw that it's been debunked that either Crookshanks or Mrs. Norris are animagi, but no mention of the toad.
On the other hand, would she pull the same trick twice? Maybe Luna will kiss it and it'll turn into a prince . . .
No, wait, the wizarding world doesn't have princes.
...Hey, that's it!! Neville's toad is a Prince! It's Snape's muggle grandfather! No wonder Snape hates Neville. It explains everything!
TS
(having waaaay too much fun)
But it would be fun if Luna kissed Trevor and turned him into ... someone.