Qual o significado de "its thick, ugly head"

"The frog stretching forth its thick, ugly head from the water" é a frase na qual no livro me causou grande incomodo.

Procurando por um significado que encaixe bem não achei nada além de
thick-headed ( https://www.macmillandictionary.com/dic ... ick-headed )
e
"OBTUSE, STUPID" ( https://www.merriam-webster.com/dictionary/thick ).

Seria esse o significado correto a se usar?

Contexto: She looked round to the side from where the voice came, and saw a frog stretching forth its thick, ugly head from the water. "Ah old water-splasher, is it you?" said she