Frass
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Frass refers loosely to the more or less solid excreta of insects, and to certain other related matter.
Bedstraw hawk-moth caterpillar leaving the frass behind
Typical sculpting of a frass pellet of a large caterpillar
A thistle tortoise beetle larva carrying a mass of its own frass as a repugnatorial defence.
Lepidopteran larva frass after soaking in water
Honeydew (secretion)
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Honeydew is a sugar-rich sticky liquid that is secreted by aphids, some scale insects, many other true bugs, and some other insects as they feed on plant sap. When their mouthpart penetrates the phloe
Frass
…anything that insects had eaten, and similarly, to other chewed or mined refuse that insects leave behind. It does not generally refer to fluids such as honeydew, but the point does not generally arise, and is largely ignored in this article. Such usage in English originated in the mid-nineteenth century at the…
An aphid produces honeydew for an ant in an example of mutualistic symbiosis.
Honeydew drops on leaves
Bald-faced hornet sips honeydew from a Disholcaspis quercusmamma gall covered by sooty mold
Honeydew puddle under a tree