Fuck that was tough. Giving it a 2/5 for reasonableness. Probably the worst Connections there's ever been as far as I'm concerned.
Spoiler
Never heard of pot sticker. Purple was my leftovers, though the other 3 entries were reasonable enough.
I've never heard of any of the mushrooms. Luckily morel had no other meanings so I was forced to Google it, which told me to was a mushroom. So then I Googled to see which other ones might be mushrooms. Which found the right results. But needing to Google the entire category even when you know what it is.
I tried for a bit to find terms for the mouth. Trumpet, hole, smacker.
And I've never heard of smacker or clam being used to refer to money.
That's three categories with obscure or American-specific references.
Clams might be from the Flintstones and I know I've heard it used for money. I had a hunch then that smacker was also money but had too search to be sure.