prepollex

[ pri-pol-eks ]

/ prɪˈpɒl ɛks /

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noun, plural pre·pol·li·ces

[pri-pol-uh-seez]. /prɪˈpɒl əˌsiz/.

a rudimentary additional digit on the preaxial side of the thumb of certain amphibians and mammals.

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Origin of prepollex

From New Latin, dating back to 1885–90; see origin at pre-, pollex

The digits (and metacarpals) are considered by Ritland to be 1-4, in addition to the prepollex, rather than 2-5.
The Ancestry of Modern Amphibia: A Review of the Evidence|Theodore H. Eaton
There are no ventrolateral glands, glandular area on the chin, or enlarged prepollex.
Descriptions of Two Species of Frogs, Genus Ptychohyla|William E. Duellman
Males in the Hyla maxima group have a protruding bony prepollex like that characteristically found in Plectrohyla.
Neotropical Hylid Frogs, Genus Smilisca|William E. Duellman
Breeding males have dark brown nuptial excrescences on the prepollex.
Neotropical Hylid Frogs, Genus Smilisca|William E. Duellman

Each of the last two has a bony prepollex, rather rugose skin on the dorsum, and more squat body.
A Review of the Middle American Tree Frogs of the Genus Ptychohyla|William E. Duellman