"You're a dumb, ugly, backwater zero!"
Taunted school chums of poor Agnew (Spiro).
But he gave them cuisine
From the Greek street-food scene,
And his sobriquet's now "Small-Town Gyro!"

Based on the suggestion: "small-town gyro"

A doula who came from Missoula
Made a YouTube on "prepartum hula."
Her Hip-Rolling Spiral
Immediately went viral,
And now the gal's rolling in moolah.

Based on the suggestion: "doula"

Doula: n. A woman who is trained to provide support to women and their families during pregnancy, childbirth and the period of time following the birth.

Here's a practical joke that a LARPer
Can play on their friend who's a harper:
Tune her strings each to A,
Then invite her to play
At the Elvenqueen's feast (and then scarper!)

Based on the suggestion: "harp"

LARP stands for Live Action Role-Playing [Game].  LARPers tend to dress in costume and participate in historical recreations or fantasy situations.

And, in case it's not clear from context, "to scarper" means "to flee."