I love lentils, I'd do one lentil dish and one none.
So, either lentil soup, and something like cheese enchiladas.
Or something like pasta with lentil and walnut bolognese and then a different soup.
This is my family's current favorite vegetarian soup:
https://monkeyandmekitchenadventures.com/thai-curry-brussel-sprout-soup/
That with some peanut noodles would be a great meal, but I don't know that that soup would freeze well. Just offering it as an option if you were open to donating 2 soups.
Or soup as the main meal, and then frozen lentil/walnut bolognese sauce and some pasta (my kids like bolognese on cheese ravioli) instead of a frozen soup could be delicious.