I would say a mouse would be rather large for even a full grown Tokay. Stick with pinkies. I once tried a rat pinkie and the Tokay had truoble with it resulting in it shredding the pinkie rat and only eating what was left in it's mouth. It's not unusual for a tokay to not eat something that is not alive and moving. A pinkie once every other wek will fatten him up just fine, they should only be used as a snack and not a staple diet. good luck
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My posts and replies are my experiences only
1.2.15 Tokays
1.4.10 Leos(13 albino)
1.2.0 AFT's(amel male)
0.2.0 Stenodactylus Petrii(Dune Geckos)