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I dunno if this is any help or inspiring but I immediately thought of the PP Skorne Rasheth model from the hordes range.
Could be worth a look http://privateerpress.com/hordes/gallery/skorne/warlocks/dominar-rasheth
I don't know if you can bits order just the slave guys and the disk?

Yeah, sorry about that it was just the first thing that game to mind, I've wanted to use it for that purpose for a while now. Those agonizers have a very amphibious feel to me.
Perhaps try a good quality toy manufacturer like Schleich.
I've often seen their models used as they are nicely detailed, fairly hard plastic and some of their sculpts come in a range of sizes.
I'm sure I've seen a frog or toad from them before.