Hello and any advice

[Louis Charles Bruckner]

Tongue Flicker is correct.
The tree frogs do need to be separated from the toad.
For many reasons.

Can you take pictures of each frog and the toad?

The one frog pictured is a whites tree frog and needs very different conditions than the toad.

Also it looks like you have moss in the enclosure.
Moss is not a safe substrate for either the toad or tree frogs.
It can cause impaction if swallowed.

There are great care sheets for both the whites tree frog and toads here.
You are correct if the size difference is too great in between the two tree frogs, the smaller one might become
meal for the larger one
So you might have to separate the two.
if you can take a picture of the two with a common objet to judge size that will help.

There are a lot of good people here that are very willing to help you get you new
boarders happy and healthy.
And in turn give you years of enjoyment.

We just need to see what you have and we will be happy to guide you along
being a keeper.

Welcome to the forum!
Cheers! from across the pond.

[Mentat]

Hello and welcome to FF Toby. Louis gave you some advice and links to the forum care articles; please do read those and adjust the enclosure parameters as required.

Recommend move the little tree frog to a hospital like enclosure (damp unprinted paper towels for substrate, a water dish, artificial plant and sterile branch). Change paper towels daily or as needed when soiled and replace the water dish with clean dechlorinated tap water daily too. Also, cover all sides with aquarium background or any paper you like to reduce stress.

At this time think an unflavored Pedialyte or similar baby electrolyte solution bath would be helpful. You prepare that, by mixing 10% electrolyte with 90% dechlorinated 27C water. Next evening, place frog after it wakes up, in small critter keeper (or plastic bowl with holed-up top) for 20 minutes with solution to its chin level. Afterwards return to hospital tank and offer food. If frog gets too stressed, can also do the same but instead of bath; wait for frog to be sleeping and carefully use a dropper to trickle solution on frog's back.

Crickets and insects should be sized same as distance between frogs eyes. Gut load them with veggies (carrots and lettuce) and cereal (oats and cherios) at least 24 hours before feeding. It's easier to monitor feeding if you place crickets in a small glass bowl around 5 cm. height; crickets won't escape. Let us know if frog eats, hope this helps and good luck !