"What do you call peanuts with…

“Packing peanuts” are not actual peanuts, and there is no “packing” (of firearms), but there are jokes.

”...packing peanuts, you say? *draws a little peanut with a gun* *becomes a famous cartoonist*” was posted on Twitter by Hober Simsum on May 30, 2014. “Packing peanuts are carrying guns?” was posted on Twitter by MarcusRufusJest on September 10, 2018.

A riddle was posted on Reddit—Dadjokes on November 30, 2020:

Q: What do you call peanuts with guns?
A: Packing peanuts.

Wikipedia: Form peanut
Foam peanuts, also known as foam popcorn, packing peanuts or packing noodles, are a common loose-fill packaging and cushioning material used to prevent damage to fragile objects during shipping. They are shaped to interlock when compressed and free flow when not compressed. They are roughly the size and shape of an unshelled peanut and commonly made of expanded polystyrene foam. 50–75 millimetres (2-3 in) of peanuts are typically used for cushioning and void filling packaging applications. The original patent was filed for by Robert E. Holden in 1962 and was granted in 1965.

Twitter
Hober Simsum
@fearwig
...packing peanuts, you say? *draws a little peanut with a gun* *becomes a famous cartoonist*
9:35 AM · May 30, 2014·Twitter Web Client

Twitter
MarcusRufusJest
@MarcusRufusJest
Packing peanuts are carrying guns?
10:29 AM · Sep 10, 2018·Twitter for iPhone

Reddit—Dadjokes
Posted by u/DrSwagtasticDDS November 30, 2020
What do you call peanuts with guns?
Packing Peanuts

Twitter
Dad
@ImYourDad___
What do you call peanuts with guns?
Packing Peanuts
11:36 PM · Nov 30, 2020·IFTTT

Twitter
keepingitcreel
@Keepingitcreel
What do you call peanuts with guns? Packing Peanuts
3:13 AM · Dec 1, 2020·IFTTT

“What do you call peanuts with guns?”/“Packing peanuts.”