Learn English – Can the word “desk” be used as a verb

Snob does not appear as a verb in the OED¹, Wiktionary, Dictionary.com, or Merriam Webster. Even Urban Dictionary doesn't seem to define it as a verb, but only as a noun. So I don't think it's "creeping towards accepted usage", unless it's doing so very, very slowly. (I don't hear either word enough to make a judgement based on personal experience.)

Is using "snob" as a verb forever a no-no?

No. The English language is constantly changing and in flux—just don't expect it to be commonly accepted usage soon.

¹The OED has two definitions for "snob" as a verb, but they are both obsolete and are for completely different words that just happen to share the same spelling (but not etymology, definition, etc.).

This is, I learn, called conversion in lingustics:

also called zero derivation, is a kind of word formation; specifically, it is the creation of a word from an existing word without any change in form

making a verb out of a noun:

Verbification, or verbing, is the creation of a verb from a noun, adjective or other word.

In English, verbification typically involves simple conversion of a non-verb to a verb. The verbs to verbify and to verb are themselves products of verbification (see autological word), and—as might be guessed—the term to verb is often used more specifically, to refer only to verbification that does not involve a change in form. (Verbing in this specific sense is therefore a kind of anthimeria.)

Examples in English number in thousands and this is a very potent source of neologisms, due to the fact that newly coined words take a well defined meaning from the noun. It is typically used when there is no ambiguity (compare to tape with to glass; while tape is an object with clear dominant use, glass is not so it is not so effective).

Of course, prescriptivists oppose it on principle, but also others oppose it when it is not done 'in the spirit' of the language, for example the following quote from Bill Waterson's:

Calvin: Verbing weirds language.

is perfectly understandable, but it sounds very strange.

In cases where it does not weird it - it is easily accepted. In your example, the way the noun 'tape' was verbed into verb 'tape' provides an established path for "duct tape" to follow.