I can honestly say i had my tag licks ready last week when fretmentor assigned them, but i can't take credit for them. I had gotten them from a guitar website i subscribe to, in their bluegrass section. They call them licks, but they can be tags. I have 2 D licks, 2 C licks, and 2 or 3 G licks. They sound cool when played properly at full speed (i haven't achieved that yet)
I think they are too long for a tag, in fact, i would consider these runs, but they could be modified for a tag. I think a tag should be around 10 notes max. Anything more, and you're playing lead guitar.
Don't know if you guys ever noticed, but there is a little G tag in "Will the Circle"...