What's the deal with nouns that sound like verbs?The connection to dangle seems semantically close, given the nature of the creature named. Maybe there are enough verbs in the lexicon compared to other lexical categories (parts of speech) that we think verb from the sound shape? You don't get good rhymes but with other vowels, there are plenty: Tingle, mingle, wrangle, tangle, etc. versus angle (surely more common in its non-verbal form), single, etc. Check out some patterns for yourself here.
*If you don't know, see here.