frozen food

I bought too much veg for him this week and it'll go off before he can eat it, can I Freeze it and save it for later? It was fresh when I bought it so I thought it'd be okay but I just wanted to double check...

I read online that dandelion leaves can be frozen and good for 10-12 months, as long as you blanch them in boiling water for 2 minutes before freezing. Has anyone tried this? Does the blanching affect how safe it is to feed to the tortoises?