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"Gruntle" is not an animal but an animal sound. One example of an animal that makes gruntle sounds is a pig.
snout
The pig has a flat surface containing its nostrils called the planum nasale.
assuage, conciliate, gentle , gruntle, lenify, mollify, pacify, placate
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a pigs mouth is a technically a snout but, in particular, a pigs "snout" is called a "gruntle"