Where does “tree frog” come from?

tree frog (English) comes from English Frog, from Portuguese froco, from Latin floccus, from Frankish flokko, from Proto-Germanic *flukkô, from Proto-Indo-European plewk-, from Proto-Indo-European plew- — to fly, flow, run.

tree frog (English): A frog of the family Hylidae, of small size and...

Definitions

A frog of the family Hylidae, of small size and...

Ancestry of “tree frog”, step by step

tree frog traces back through two separate lines of ancestry.

via English Frog

Step	Language	Word	Meaning
1	English	Frog	Alternative form of frog
2	Portuguese	froco	flock
3	Latin	floccus	tuft, wisp of wool
4	Frankish	flokko	down, wool, flock
5	Proto-Germanic	*flukkô	—
6	Proto-Indo-European	plewk-	to fly, flow, run; to splash, to flap with hands
7	Proto-Indo-European	plew-	to fly, flow, run

via English tree

Step	Language	Word	Meaning
1	English	tree	A perennial woody plant, not exactly defined, but...
2	Middle English	tre	A tree or a plant that resembles one

Every word from Proto-Indo-European plew- →Every word from Proto-Indo-European plewk- →Every word from Proto-Germanic *flukkô →