Rex: Who's the youngling?
Ahsoka: I'm Master Skywalker's Padawan. The name's Ahsoka Tano.
Rex: Sir, I thought you said you'd never have a Padawan.
Anakin: There's been a mix-up. The youngling isn't with me.
Ahsoka: Stop calling me that! You're stuck with me, Skyguy.
[Rex starts chuckling.]
Anakin: What did you just call me?! Don't get snippy with me, little one! You know, I don't think you're even old enough to be a Padawan.
Ahsoka: Well, maybe I'm not. But Master Yoda thinks I am.
Anakin: Well, you're not with Master Yoda now. So if you're ready, you better start proving it. Captain Rex will show you how a little respect can go along the way.
Rex: Er ... Right. Come along, youngling.
Ahsoka: [through gritted teeth.] Padawan.
Battle droid: Surrender, Republic dogs!
Rex: We've got you outnumbered!
Battle droid: Outnumbered? Wait. One, two ... [gets blasted apart.].
Battle Droid Commander: Concentrate your fire on sector 11374265!
Battle Droid: 1137 ... What was that again?
Battle Droid Commander: Just fire right there!
Battle Droid Commander: Count Dooku demands a report on your mission. Shall I tell him they got away, or what?
[Ventress tosses him telekinetically into the abyss.]
Battle Droid Commander: Whyyyyyyyyyyyyyyyyy...?
Answer: Canon in the Star Wars universe is a somewhat complex term as it has several levels ordered in a hierarchy of precedence. Facts stated at a certain level are considered as canon, unless contradicted by something at a higher level of canonicity. The uppermost level of canonicity are the six live-action films. Lucas has stated that the television episodes (which include the Clone Wars movie, which can be considered as the first episodes of the TV series) are to be considered as the next level down in canonicity, so below the films, but above any other releases (books, comics and so forth). So, basically, yes, they're to be considered canon, except in any case where they contradict something established in the live-action films.
Tailkinker ★