National Park Service: Hawaii has a terrestrial herpetofauna consisting of six frogs, 19 lizards, one snake, and four turtles.
This page lists 14 species: all from USGS Nonindigenous Aquatic Species (NAS) database's USGS Nonindigenous Aquatic Species database: Species List, Amphibians, State = Hawaii.
14 are nonnative. National Park Service gives a total of 6; the 14 here are the frogs and toads official sources name one by one.
Which frogs and toads can hurt you
Official sources single out these frogs and toads in Hawaii, in their own words:
Toxic. “…this toad soon spread beyond the canefileds and into gardens and other urban areas where it can cause illness or even death if licked by pets or small children.” Bishop Museum
No official source we use states whether this animal is venomous. That does not mean it is harmless: do not handle it.
Size
Usually 6 to 8 inches long (NCWRC); can reach 8 inches or more and weigh over 2 pounds (CDFW). Missouri gives 3.5 to 6 inches snout to vent, occasionally to 8.75.
How to recognize it
No ridge (dorsolateral fold) down each side of the back
Large round eardrum: about twice the eye in males, about eye-sized in females
Fully webbed hind feet, longest toe extends past the webbing
No official source we use states whether this animal is venomous. That does not mean it is harmless: do not handle it.
Danger to people
“…this toad soon spread beyond the canefileds and into gardens and other urban areas where it can cause illness or even death if licked by pets or small children.” Bishop Museum
Size
Florida FWC: generally 6 to 9 inches long. UF/IFAS: adults are 3 to 6 inches and some reach 8 or 9 inches.
How to recognize it
Large glands behind the eyes that angle down onto the shoulders and give off a milky-white toxin
Glands are large and somewhat triangular, tapering back to a point
No knobs or crests on top of the head; a ridge around the eyes and above the nose
Bullfrogs lack the dorsolateral ridges that green frogs have.
Photos show typical adults; individuals vary. Never get close to compare.
When frogs and toads are active in Hawaii
Records of frogs and toads in Hawaii peak in February, June to September and November to December. They show when people record frogs and toads, not how many there are (about month bars).
JanFebMarAprMayJunJulAugSepOctNovDec
958 records of frogs and toads in Hawaii by month (GBIF, CC0 and CC BY records).
If you are bitten or stung
Call 911 or Poison Help at 1-800-222-1222 right away. Poison Help connects you to your local poison center, any time of day.
Official advice from Bishop Museum:
Cane toads can sicken or kill pets or small children who lick them Bishop Museum
How to report
Invasive species (including any snake sighting): Pest Hotline 808-643-PEST (643-7378) or online at 643pest.org. Hawaii DLNR
“…this toad soon spread beyond the canefileds and into gardens and other urban areas where it can cause illness or even death if licked by pets or small children.”
“…where it can cause illness or even death if licked by pets or small children.”
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