What is the difference between a frog and a trombone player?
The frog might be on his way to a gig!
Alright listen up, buttercup. So, the joke is playing on the similarity between a frog making noise and a trombone player making noise at a gig. Get it? A frog croaks, and a trombone brrrraps. Plus, frogs do hop around to different spots just like musicians go to gigs. I bet you didn't even know that trombone players play gigs. Probably didn't even know what a trombone was until now, did you?