yup, that's the ivy. he/she may not begin eating vegetation right away but I wouldn't risk it. Use just pothos for now (ficus and schefflera are good standing plants).
He is obviously VERY young - too young to be sold in a "normal" situation. how/where did you get him? His story might help in determining any issues you may run into. If he is wild caught (wc) rather than captive bred (cb) he probably has parasites. Do you have a good local herp vet? You may just want to get him checked out and definitely get a fecal sample checked.
You may actually want to get him into a glass tank for now in order to maintain some humidity. Dehydration can be a real problem and in a free range setup you willhave a hard time keeping humidity up. Being regularly dehydrated can lead to even more serious organ problems. Do you see him actually drink from the dripper or off leaves? His eyes need to be well bulged out and not flat or sunken in any way (sign of de/hydration).
You said he was eating crickets? The rule of thumb is no feeder wider than its head so you really need little pinheads for him. Fruit flies are another option.
As for spots and color changes the marking on its side and around the mouth are fine.
Please read the article I linked below. It is about baby cham care up to 4 months. It discusses supplements, humidity, temps, cage setups, etc.
lele
baby care
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0.1 veiled - Luna
0.2 house geckos - Gaia & Tia (MIA 
0.2 felines - Kyndra and Líta