Is tellurium a metalloid?
Tellurium will almost always be considered a metalloid, yes, due to its chemical properties that lead it to be classified as such.
You'll find that six are most commonly considered metalloids (in descending order of most classifications,
Another interesting detail about this source is that no element is regarded as a metalloid by all of the sources...
All in all, the classification ultimately depends on context and the desired classification. That is to say, in some respects a certain element behaves more like a metalloid, but not as much when regarding a different property.