My first character ever was a grung, which I picked because I thought they were cute. I made her the smallest she could be (2 ft tall?) because I didn't really like the idea of a BIG frog.
Her contribution to the human BBEG fight at the end of our first campaign was shoving her arm in the BBEG's mouth. He got this treatment for trying to give this super long speech while simultaneously threatening a bunch of dwarf prisoners. My grung shouted something like, "You talk too much!" and it was all very cool at the time.
I asked if she could poison his tongue so it would swell up and the DM said sure. The BBEG failed his save and I guess had no Legendary Resistances? (At the time I didn't know LR was a thing, and apparently neither did my DM?)
A bit later it was the DM's turn and we all hear these note shuffling noises and him going
uhhhmm hmmm. The BBEG tried to bite my grung's arm off, but she rolled well, so she just stayed perched on him with her whole arm in his mouth. The rest of the party whomped him.
After the fight, the DM revealed he had written all the BBEG's abilities with a verbal component, so since he couldn't talk anymore he couldn't use any of them.
I played my grung as a serious but naive character. The other party members did not take her seriously sometimes, not because of her size but because grung become adults at 2 years old, so she was a 2-year-old adult. I should have just made her 26 or something, but I didn't know much about making characters then. See also: I wasn't sure if I was required to include the canon grung lore, which is pretty horrible, so I just said her dad killed all the "bad" grung and became the grung emperor, but she ran away because she disagreed with his methods.
I think over time the party's view of her went from wacky little character to "danger frog".
I suppose this is its own brand of comedy, but the party spent a lot of time trying to keep NPCs from underestimating her.
She was disintegrated by a beholder at Level 9ish. RIP.
The 2 gnomes in that party are still here, six years later!