My money’s on:
avocadæ
Tripler
Because it makes you look like a good cook, and a smart cook!
Guacamole.
The earliest use in English, in the form “avogato pear,” seems to be in 1697, in William Dampier’s A New Voyage Round the World.
This became corrupted to “alligator pear,” probably influenced by the fruit’s knobby green skin. This is actually the name I first encountered for the fruit, in a natural history book published in the 1950s. Avocados were essentially unknown when I was a kid, at least in the far reaches of the Bronx. I didn’t try one before the 1970s.
Dammit, how I want some nachos, stat.
Not nachoes?
Nachae.
Tripler
Dammint, now I’m hungry.
The avocados number 6.0221415 × 10^23.
That’s the Guacamole referred to earlier.
A batch of guacamole made from a mole of avocados would be approximately half the mass of Mars. Guac is less dense than rock so although lighter, the one-mole batch of guac would be about the same size as Mars. Better bring a lot of chips.
And for a somewhat less tasty concoction made in molar quantities there’s always this inspirational recipe: A Mole of Moles 
If you’re using Latin/Italianate pluralization, I think it would be avocado/avocadi and nacho/nachi (well, naccio/nacci).
I am used to “tomatoes” and “potatoes,” but “mangoes”? Huh. When I have Chrome’s spell check set to US English, it indicates that is correct. But if I set it to UK English, it accepts “mangoes”, but also accepts the less cluttered spelling “mangos.”
The plural of “dynamo” is still “dynamos,” though.
If you have a large group of avacadoes, it’s an avacaherd.
Groucho: “Do you know how alligator pears are made?”
Margaret Dumont: “I’ve not the slightest idea.”
Groucho: “That’s because you’ve never been an alligator. And don’t let it happen again.”
Honest story: the first time I watched The Cocoanuts it was a **Spanish **dub. They had to do some rewriting on the bit about the avocados since in modern Spanish aguacates have jack to do with alligators.
A wedge of ripe avocado with olive oil and a pinch of salt is a fine thing to have on your dish.
It’s even better if you put the rest of the avocado right alongside that first slice. 
They’re also nice with a light dusting of your favorite Cajun spice. One like that is part of my breakfast most days.
I had never thought about that–because who would? Good ole xkcd.
I thought moles usually involved chilis and chocolate?
And if you want to know how not to cook them, it’s avocadon’ts.