different between whuffle vs chuffle

English

whuffle (third-person singular simple present whuffles, present participle whuffling, simple past and past participle whuffled)

(intransitive) To make a low snuffling or blowing sound.
- 2010, Peggy Nicholson, Serpent in Turquoise (page 72)
  Poquita whuffled and jerked at her lead, trying to swing right around. “No, no, we can't go home yet. Not for a silly snake. We just scared him is all.”

Onomatopoeic, but compare chuff (the sound of the exhaust of a steam engine) and -le (verbal suffix conveying frequentativity).

chuffle (third-person singular simple present chuffles, present participle chuffling, simple past and past participle chuffled)

chuffle (plural chuffles)

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