Fakemon Advice

I'm working on revamping my fakemon project starters and I'm a bit stumped on the design for my grass starters final evo. Background: the final evo for my grass starter it's called Gaigantoad it's main theme and inspirations are rough skinned frogs, rpg enemy golems. Typing is grass rock and design concept would be as it evolves too the third stage it would slowly get covered with rocky warts.
Other Info the region is based on Greece and I'm doing unused starter type combos

Any advice or ideas would be appreciated