I'd lean toward "Fling" since the verb feels more like an ability or an attack. But it's no big deal.
Skills appeal.
Reckless Offense is a good fit. Improved Grapple requires Improved Unarmed Strike, and I don't really think they need it. How about Power Attack, or Point Blank Shot for flinging filth?
Dammit, I keep on forgetting the pesky Improved Unarmed Strike prereq. The reason I fancy Improved Grapple is, unless my memory of Gulliver's Travels plays me awry, the Yahoo's spent a lot of time punching and wrastling with each other. Indeed, I vaguely recall them attacking Semuel at some stage.
Hmm, that suggests giving them Improved Unarmed Strike as a bonus feat, and Improved Grapple and Reckless Offense as regular feats.
If that's the case, I could see Improved Unarmed Strike and Improved Grapple. I'd rather not give 'em a bonus feat. It meets the prereqs for both, so let's just go with those two feats, OK?