Can you use an iron on decal on a crochet blanket?

I'm crocheting my first baby blanket and I'd like to put an iron-on winnie the pooh on it for my baby's nursery. Can I do that? Will it ruin my blanket? If nothing else, could I cut out a piece of fabric matching the decal and put it underneath the blanket with the decal on top of the blanket (like a sandwich) so that the glue has something to grab onto through the holes? The holes are pretty tight, too. You can barely see through them. Thanks in advance for any advice, and please be gentle. I'm a beginner!