This is one of those cases where there are two hostas with the same name. One is registered and, therefore, the "official" version of H. 'Wild Thing' while the other is a non-registered plant and needs to be renamed to avoid further confusion.
 

This cultivar of unidentified parentage was registered by Dr. Dick and Jane Ward of Ohio in 2009. It is a medium size plant about 14 inches high by 30 inches wide with medium green foliage that has deep veins. The leaves are slightly rippled, moderately wavy, ovate and dull on top. It bears tubular shape flowers from mid-July into August. It is the one in the picture above.

Hosta Helper will call this plant 'Wild Thing' (Ward)

As described in Mark Zilis (2009), this non-registered cultivar from Kent Terpening forms a small size mound of narrow, folded foliage. The leaves are bright green with a narrow yellow, marginal variegation. It is the one shown in the picture below.

Hosta Helper will call this plant 'Wild Thing' (Terpening)