A mini-Taxxon is the type of mini from the Animorphs continuum. They're identical to regular Taxxons, only much, much smaller. Their appetite, however, is pretty much the same.
In canon, Taxxons are a large, centipede-like alien species that is always ravenously hungry, to the point that they will even eat themselves if injured. They are voluntary Controllers to the Yeerks and formidable opponents.