The first one has a very good body and head, but the mouth and teeth seem a bit overboard. The second's base seems good, but the rest look a lot more like a worm's than a plants. The third looks like the best overall, with the trunk being very plant-like, and the mouth's "teeth" looking more like those of a venus fly trap and not actual fangs.
I love the left and middle design best. though i think the middle one is closes to what i imagined, though its stalk needs to be thinner and more flexible, and the head maybe a little larger with a long tongue slobbering about like the left design.